So at no point did he ever feel like a scumbag for letting scummy backstage shit like that happen? It sounds like he's of the mindset that it's expected for female fans to give it up (he even mentions his bros were "fake cheering" him when returned). I think that says a lot/explains why these accusations are something he doesn't understand.
This dude isn't a rockstar, you know, right? I can't imagine more than 50 people went to that show. It's not like he, or any band, or most likely any band he's ever toured with at their level, have that mindset about female fans. If she was even a real fan, not just a girl who went to a show to support friends in another band.