I"ll agree that Faye was being her oft-miserable self when acted as if a fifty-person block party was, I don't know, in her bedroom or something (wouldn't that be interesting?), but I'll give her a break because I think she senses Angus isn't 'over' her, and it makes her nervous. It's one thing to have a relationship with manwhore Sven: having someone actually *want* you is something entirely different.
If he'd said something like "That sounds like a lot of fun, I might see you there," that wouldn't be creepy, but inviting himself along feels like a bid to specifically be part of FayeHanners/etc. group, as if he were one of their friends. He's not creepy because he wants her, he's creepy because he's being pushy and refusing to take "no, I'm not interested" for an answer. I've had the same thing happen, and guys like that are extremely annoying, especially when they stop just that bit short of going over the line, but consistently dance on the edge. Yeah, he does seem to come across as wanting humiliation play, and getting turned on by her insulting him.