Will doesn't even seem to register what Matthew's done until the chomp chomp hits his ears, and even then? He gets a quick glance, Will making sure he's eating the sad remains of the glove compartment instead of anything else, and that's it. He has nothing to say to such rude and snoopy behavior, and it's not like he can't afford another bag of Bronzefish.

"Sure." A lackluster reply if there ever was, but there's no bite, no growl, no hidden bitterness. Friends? Sure, they can use that word. Will's issues stem from the word itself rather than it being used in regards to he and Doctor Chilton anyway (mostly). "But I don't think my relationship with Doctor Chilton is really conducive to telling you about myself. Unless you're a believer in birds of a feather flock together, I suppose."

If Matthew notices how people drive, he'll notice that within city limits? Will is very mindful of speed, stop signs, pedestrians, one of those perfect drivers. But once they get out of that, the whole perfect driver rather goes out the window. Will doesn't exceed the speed limit by extreme degrees or act like he's got no sense, but the whole caution from before isn't the same.