Since arriving in this strange place (Starklandia? Really?) Peter had been faced with the idea that there were multiple versions of himself from different dimensions. He'd virtually met some of them, and met in person some others. It was absolutely bizarre, but it was pretty much the sci-fi nerd's bread and butter. Besides, he'd died and returned in space and transported before the battle with Thanos... this was a little less weird, tbh.
Coming across another version of himself in the village square, performing some kind of tech surgery on a wristwatch and a screwdriver, though? It was a little intense. He broke into a grin at the sight of the other him, looking so very much like him that he had to laugh. Laugh or freak out, right?
"I'm sure Tony can help you find something stronger."