Peter narrowed his eyes when Superman seemed to simply shrug off the idea of a face full of acid as awkward and potentially messy. "So you're immune to acid?" He guessed, which you know - cool - but also the sort of thing that Peter maybe didn't wish he could do himself but was keenly aware that there was something very interesting about powers like that, they were the kind of powers that few people had in his experience.
That coupled with the kind of strength needed to break the webbing, yeah, Supes was a curious case. Peter shrugged. "I mean I went to school, but I don't think I'd call myself a scientist" He shrugged. "I actually work for the Daily Bugle, I'm a photographer." Well he was a contractor with the Daily Bugle but it was close enough. "It helps me balance things out so I can still you know... save the day and get paid along the way."
"What do you do? I mean other than this?" Sure maybe he was curious, it was just who Peter was, and well Superman didn't seem all that eager to start sharing his life story outside of the suit, but maybe Peter could help make him more comfortable with the idea of it.