From Legs McNeil of Punk Magazine: "This wonderful vital force that was articulated by the music was really about corrupting every form—it was about advocating kids to not wait to be told what to do, but make life up for themselves, it was about trying to get people to use their imaginations again, it was about not being perfect, it was about saying it was okay to be amateurish and funny, that real creativity came out of making a mess, it was about working with what you got in front of you and turning everything embarrassing, awful, and stupid in your life to your advantage."
But I also know that as I got a little older (into my later teens/20's) there were definitely a lot of fellow "freaks and geeks" that were drawn to punk and other ostensibly "outsider" music and art forms.
I think a lot of it had to do with being the sort of people who either never had it in them to be part of the "in group" and were forced to learn the joys of exploration/experimentation, or those who just had a natural curiosity and maybe a bit of a contrarian outlook that led to that sort of thing.
But yeah, I definitely remember quite a few times being brushed off by the other "alt" kids in school because despite sharing a lot of cultural interests, I had fairly strict parents and wasn't allowed to dress "wild" (or what high school kids considered "wild" at least).
The punk ethos is a real thing. And the punk look is a real thing. Sometimes they overlap. Sometimes they do not.