You know, I've heard this angle before, how a male homosexual steward started the whole aids thingamajig. I did a little novice research here, and at the risk of being verifiably lambasted by our resident AIDS expert, highlander, I'm going to have to disagree with the notion that gaëtan dugas was the one that started it (though he certainly didn't help the situation).
AIDS has been identified as early as the late 1950s. it's assumed that AIDS spread to the Americas from Haiti via the Republic of Congo in the late 60's, but was rather unknown until being identified in the early 80's.
personally, I think that it could be safer to say that the reason AIDS spread so quickly was due to promiscuity rather than one's sexual preference. This is due to the fact that people who have had it pre-1970 were unquestionably heterosexual.
In my opinion, it's fine for you to be against sharing your bed with bisexual men, but i think your reasoning is a little flat.
I don't think this is bigotry at all. It's just a preference as to whom you want to spend your time swinging with. It just happens to be a broader scope in comparison to height, weight, eye color, etc. Personally, I'd rather know people's honest opinion about where they stand with having me in their bedroom. It's a huge turn-off not to be able to be myself at the risk of making someone feel uncomfortable.