Biphobia

Biphobia is prejudice directed at bisexual people. Its most common form isn’t fierce hostility but denial: calling bisexuality “just a phase,” “not having figured it out yet,” or “greedy fence-sitting,” or insisting a person will “have to pick a side eventually.” That denial can come from straight and gay communities at once — being unrecognized from both directions is a big part of why many bisexual people feel “invisible.”

Painting bi people as unfaithful or untrustworthy belongs here too. For related myth-busting, see Is bisexuality just a phase? and Are bisexual people unfaithful?; alongside homophobia and transphobia, it belongs to the same family of anti-LGBTQ prejudice.