if i can chip in;
Bisexual intolerance mainly comes from fellow gay and lesbian people, more so lesbians in my understanding and experiences. they say they dont want a 'person who's had a dick inside them' or 'will end up cheating on me (for a man if a girl or on anybody else if a guy). the daddy issues lesbians tend to make it out that the bisexual will run off with a filthy man, and its less of an issue with gay men but if they take issue to it, mainly they just think the bi person will just cheat on the,m. no sex of the cheater involved just 'because you're bi you're more likely to cheat' its the lesbians that tend to bring the 'dirty man' gendering involved.
Also, many people don't consider opposite sex bi folk. and when these people show up at pride, they may be hassled because 'eww no straight people at pride' even though both or atleast on of the couple is bisexual (or pan sexual or whatever fucking multi-gendered sexuality there is idk).
Hell ive heven heard people say 'its ok for you to be Bi.... BUT you have to end up in a gay relationship' same biphobic shit tbisexuals have to go through with homophobic straight people 'its ok for you to be bi... IF you end up in a straight relationship'
It's kinda fucked tbh. just thought i'd share what bit of info i know
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And THIS is why polyamory tends not to work... people not FUCKING COMMUNICATING.