[Buffy]
I'm not saying he's a bad guy, because he's not. When I haven't wanted to shake him for being a bigot or locking up my niece or things like that, he's pretty likeable. But he's definitely a lot more than 'little' bigoted, and he has a right to be, given the world he comes from, but he can't keep doing it here.
No, they're all lone wolves, allies but doing their own thing. I know as much as I'd accept them as backup in a big fight, like with Glory-level bad guys, I wouldn't really trust them.
No, it wasn't, it's a valid question and he really does owe a lot of us an answer to it so we know whether we need to protect ourselves.
(No, not Lorne, a demon that Faith used as a contact.) The simple explanation is that Trance was - well, is, just not is and in 'is here currently' - a sun avatar. Which basically, as she put it, made her a demon. Pretty much the happiest, nicest person I've ever met, and Sam wanted her dead, just because he found out she was a demon.
Honestly, Sam, Dean and their father John are all like this to a degree, the other two just tend to keep their mouths closed about their opinions and, to my knowledge, aren't running around killing anything that isn't human. I'd put them further along on the road to acceptance than Sam is, definitely.
God if I know, Buffy. Apparently in his world, all demons are evil, bad, wrong and terrible, yet she gets a free pass and all I've ever seen her do is help when it helps him (like with Glory? Neither of them were at that fight).