I kinda think it would be best to just let people know about your sexuality (maybe someone would say "Me too! :oD"), but obviously that's easy to say for someone who didn't get much shit for doing that. Okay, I'll just show of my naivety: I think/hope if you told people, their reactions wouldn't be too horrible. After all it's easy to hate on things you don't know, but if there's someone you know and like who's part of this mysterious thing, people usually start to get over their weird and unfounded opinions. Or have you tried the "what if" thing yet? When someone talks shit about bisexuality, ask them what they'd think of you if you told them you're bi.