In this universe, humans don't kill tiny ants.  Ants kill tiny humans--and do much more than just that. . .

Justin, the red anthro ant, was sitting on his couch, his thorax resting against the seat.  He was a strong but scrawny fellow, with brown hair in a bowl cut, wearing a navy green T-shirt and tan cargo pants.  No shoes: he was barefoot.

He was relaxing when he saw the tiny humans--three of them!  It was an invasion, right in his own home.  They were walking out from behind his television, holding cookie crumbs in their pale, gross fists.  The ant watched as the humans slowly walked forward, glancing around nervously, surely hoping not to be seen.

Unfortunately, Justin /had/ seen them.  And his mind had hatched up an intriguing plan.

He slowly stood from his couch, grinning with delight, and walked over to them.  When he reached them, his shadow loomed over the tiny creatures, and they all froze up.  Justin used that moment to lift up his massive foot.

Before any of the humans could move, he had two of them pinned under his left foot, and one pinned under his right.  His pointed feet only had two toes, but they were large enough to pin the humans down, rendering them immobile.

He didn't want to kill them though.  Not yet.  He wanted some entertainment before they died.

First, Justin decided to play with the human under his right foot.  He rolled it up to his toes and squished it between the two appendages, feeling the soft, pink skin as it touched his shelled, exoskeleton foot. 
The creature let out a tiny cry, and seemed to be trying to communicate with him (from the word-ish sounds leaving its miniscule face hole), but Justin didn't care.  These tiny creatures were on his property, and that made them his to play with as he wished.

And he was going to make a great time of it.

He lifted his left foot, as if freeing the two humans underneath.  They were both frozen for a moment, but then they looked up at him, talking words--perhaps trying to thank him?  /That/ was funny to imagine.
Justin brought his foot back down so that the two humans were now underneath it, as if they were the soles of his shoe.  Both of them were making begging sounds, just like the other one, but he would not hear their pathetic cries.

The ant pressed his foot down--gently at first, then harder, crushing the bones of his toys.  They let out screams of tiny terror and pain, which was pleasure to his ears.  They weren't dead yet, though--he was going to have some more fun before they passed on.

Justin adjusted his foot's grip, grabbing the front of the humans between his toes, and leaving the back of them underneath his foot, as if they were his new sandals--small ones, but delight-filled ones.  Holding the humans between his toes, he lifted his foot up and began walking, using the tiny beings as his shoes, bringing his foot down against the floor numerous times.  The other human, held between the toes of his right foot as Justin traversed the room, could only watch as the ant stomped on their friends (at least, he hoped the humans were friends, as that would make this even better), over and over again.  

Finally, the ant stopped, and released the humans on his left foot.  Then, he let go of the one on his right.  The two from underneath his feet were definitely dead now, broken and bleeding on Justin's living room floor.  The human from between his toes limped over to them, saying things and yelling from its face hole.

Not that Justin cared.  He was tired of playing with them now, and he wanted to dispose of them, and nothing more.  Luckily, he /had/ been getting hungry--and the taste of human meat sounded good right about now.
He bent down over the three humans, smiling.  The one still alive tried to run, but its broken bones made it unable to run--and besides, it wouldn't have gotten far anyway.  Justin scooped up the three humans at once, and brought them up to his face.  He opened his mouth, the mandables pulling aside to reveal a toothless mouth, ready for food.  The human who was still alive let out a scream, and released begging cries from its face hole.  But Justin ignored it, and tossed the meat into his mouth.  Just trash to be disposed by him--that's all these humans were now.

He tasted them for a brief moment, feeling the distinct flavors of each one--they were especially different for the live one versus the dead ones.  Each tasted unique, and he savored them in that small moment.  Then he gulped, swallowing all three at once, sucking them through his infrabuccal pocket and toward their journey into the digestive system.  The human meat soon found themselves traveling down his petiole, and the narrow throat squeezed his toys tight before it plopped them into Justin's eager stomach.  It growled as new food entered its enclosure, then began the process of breaking them down.

His ant belly digested food twice as fast as a human one, and it quickly got to work on his meal.  Justin could feel the living human was struggling, hitting the walls of his stomach, trying to escape.  But, of course, it was no use, and his stomach acid soon consumed the human.  A minute later, the human meat was nothing but mush inside him, and it quickly traveled further in his digestive system.  Some went to the crop, stored for later energy, while the remains traveled down his postpetiole to the rest of the digestive system.  Finally, the human toys traveled to his throax, ready to be excivated.  It took no time at all, and Justin found himself needing to shit.

He walked to his bathroom, pulled down his pants and bent over the toilet.  The remains of the humans squeezed out of his rectun: a sawdust-like pile, brown with flecked spots was squeezed out and landed in the toilet with a /plop/.  Justin wiped his butt and looked down at the shit in the toilet, satisfied.  So this is all that remained of the humans now?  It was fitting.

He flushed his toilet, watching the remains of the humans swirl around inside, around and around and around, until they finally went down, gone forever.  Then Justin washed his hands, and went on with his day.