I'm gonna go with gays because straight people seem to be ok with someone being bi, and plenty of bi guys say they would only get in a relationship with women only.

A lot of gay people went through a fake bisexual transition phase, which then gives them the false impression that bisexuality doesn't exist just because they used it as a front. So gays.

In my experience; definitely gay men.

Both equally

Straight women and Gay men share the same prejudice for Bi men (He will cheat, he is untrustworthy, I'm not secure)

yep

Its definitely equal. Women act all cool about it for a shortwhile in a relationship then after some time, they start having issues with the whole thing. For gay men they are direct from the word go and its something to do with the homophobia some bi men carry towards gay relationships. Where gay men are belittled and demeaned or treated less than as compared to women. Anyway, bisexuality is equally complicated, most bis shift forever to one side (through natural shifts and do end up gay fully or straight) and others are naturally equal but are a minority. While others lean more to one side naturally, its one complicated sexuality, like asexuality.

Gays because majority of gays (on ATRL at least) thinks bisexuality does not exist.

But how is that gays being biphobic. That would be the bisexuals themselves being biphobic, no?

I don't think there's a concrete answer because there are extreme cases in all. A lot of straights actually don't mind being bros with a bi or gay guy, but usually those who are homophobic will also be biphobic. I think a lot of gays are accepting but there is always that "stepping stone" approach (see Tom Daley) and that's what makes some gays biphobic. Also the reason about "they may cheat because I'm insecure". And that applies to women too. In fact many straight women won't be in a relationship with bi men because of it.

So I think it's equal but maybe straight women edge it slightly.

In my experience gays/lesbians. They tend to think that bisexuality is fake, whether it be gay men judging bisexual men because they themselves lied about being bisexual, or lesbians thinking that bisexual girls are only using them as an experiment and will later decide they're straight. And the sheer amount of gay people that outright refuse to date bisexuals because of the dumb fear that they'll leave them for the opposite gender.

Straight women do not want to date a bi guy. Period.

Please don't speak for straight women. I was considered myself straight once (I'm still confused about my sexuality) and happily dated a bi man. I think they're underrated and I have a thing for them
OT: Gays IMO.

"please don't speak for straight women" "i'm not a straight woman" k

For the most part my statement is true.

They're being biphobic because of that.

Gays tbh
most of the straights I know are really supportive of bisexuals

Honestly the vast majority of girls wouldn't date a guy who was done anything ever with a guy. Gays aren't like "Oh you've been with a girl once 7 years ago? GET OUT #Liar" The majority of straight people see sleeping with a man as some "no going back", once you do it you're gay forever thing.

I mean the gays have a lot of work to do, but they've never actively tried to snatch rights sway from bi people like the others.

I think all groups are still very ignorant about bisexuality, but lesbians can be annoyingly nasty about it.

Gays.

Gays use it as a shield for a while and then deny our existence. Sexual appropriation
And I had a lesbian tell me that she finds bi girls repulsive, because they had contact with dick. Like it was some sort of a disease.