I've got a lot to say about this, seeing as I was pretty straight edge for a while. Haha I'm surprised you guys never ran into s Xe kids. I still have friends who are but we were friends before I was, when I was and after I was... Its just you know what they stand for and they know what you stand for... They're just like anyone else they just figured out a way to be happy without substances.
I'll write more later, but we're on our way to cop and I'm on my phone lol but I will say this... i think if people want to be straight edge, that's their decision.
Just don't get all preachy & try to force your views on others like the crazy evangelicals do.
My general assessment of this behavior is it is some breed of watered down, half-assed modern day urban/suburban Western Asceticism, although if these people were HALFWAY serious they'd abandon television, refined Salt/Sugar/Fat, meat/animal products, sex, electricity, shelter etc. My daughter was dating a kid who turned straightedge.
He was a rather weak minded kid & I think the SXE movement made him feel empowered.
In my experience these people don't last past age 16, that being said: I'd support the right of anyone to whatever they like to/for themselves the pursuit of happiness that doesn't negatively affect at least one other individual without their consent. I treat these people like I treat the mentally ill.
I'll listen to their insane gibberish for a small while say they sit next to me at a bar or other popular social setting, but after awhile I'll have to be firm and give them the patronizing "ok" and make my exit.