Blame the jerks for that one. Decent folks are usually assumed to be faking because people are often taken advantage of by terrible people pretending to be a good person. All you have to do is wait it out and show people respect. Someone's bound to notice.
Yep! And remember, it's okay to be picky about who you spend your time with. With every minute you spend with someone, a little piece of them rubs off on you, and vice versa. Good luck out there!