It's just too bad that he doesn't want to be perceived as a nerd or too into something!! He isn't that guy, ever! Katsuki doesn't even act starry eyed over his idol and inspiration, All Might, in front of other people. There is maybe one person in any world who knows just how deep of a nerd he can be, and that guy knows better than to ever advertise that to the world. That would be risking death.

"If anyone implied that shit to me, I'd break their fucking jaw. You seem to operate the same way." Katsuki still sounds irritable, but that's just his resting bitch voice. There's not much in the way of real bite in his tone anymore. "I could start a fire but it's gonna take a little time. Need to get kindling that ain't soaked, and winter ain't kind to my quirk either. Takes longer to warm up. And since you stole the goddamn show, I didn't have time to work up a sweat."

If she can see with the vibrations through the earth, Toph will know that Katsuki is turning without another word, walking towards a spot at the edge of the road... as opposed to staying directly in the middle of it. There's a bunch of branches and shit over there, so if she wants to go with that plan, she can follow his ass.