I think my title justly sums it up so read this little jewel for some examples of the lies people tell bisexuals.
Okay, I’ll give you one example. Long before I came out or had even dated a guy I stumbled onto a blog with gays and lesbians bashing bisexuals. They had been dating a same-sex person of bisexual orientation and their relationships had ended. Their bisexual partners had gone on to date another person of the opposite sex and they were being lambasted by the gay community on this site for doing so.
Um, we’re bisexual! That means that we can date a man, and if that relationship doesn’t work out then we can date a woman next if we so choose. It’s not even in the fine print, it’s yelling at you from our identity title.
http://everydayfeminism.com/2015/09/lies-tell-you-when-bisexual/