Always great to see more Canadians showing up here
It's really shitty that you've had that experience. I don't know much about lgbt centres over there in Alberta, here in T.O. we have community centres and health centres that run support groups and social groups for various identities, including bisexual folks. Maybe try places like that for RL community if you have such centres in your area? Sometimes the mainstream lgbt community isn't particularly as inclusive when it comes to the B and the T, so you have to start looking outside the mainstream and into the queer community. And as others have said, ignore the assholes. It will probably seem like a tough thing to do now, but once you've found a community that is truly queer-positive for all that queer encompasses, you might find it gets easier to stomach the assholes.