Even twenty years ago, TRAs told bisexuals like myself that bisexuality in of itself was deeply transphobic because it said that there were two sexes, male and female, and that invalidated TIM, TIF (and later NB) identities. It was replaced with "pansexual" to include everyone. Bisexuals who called themselves "pansexual" were rewarded, but bisexuals who kept calling ourselves bisexual were attacked as "transphobes."
Biphobia is so rampant that most bisexuals won't simply state that they're bisexual, because bisexuality as it stands as a neutral sexuality in its own right is deeply offensive to a huge majority of people. That has made bisexuals both bend to accept whatever people who aren't bisexual say about us, and be blamed for absolutely everything. As a group, we were primed and ready to be gaslit and abused by TRAs.
That meant that bisexuality has been redefined by the TRAs to mean "attracted to people of more than one gender," which in turn has meant that straight people are now all "bisexual," those straight people seemingly prefer to use the word "queer" anyway, and then actual bisexuals get the blame for being the ones promoting TRA the most.
I wanted to go into detail about this, because bisexuals (especially younger bisexual women) are blamed for the "wanting to be special" thing that's something that young straight people do to opt out of feeling privileged - but bisexuals have always been groomed to disassociate from the bisexual label. TRAs have simply been the most effective to make bisexuals use the words that they want us to use, whereas everyone else prefers that we "just love everyone" or "don't like labels" (or, preferably, stay silent about our bisexuality entirely) - because as soon as bisexuals realise that we're not beholden to anyone else's views of our sexualities, or discussions about who we're personally sleeping with like that has any relevance to bisexuality as a sexuality, then we'll finally be strong enough to stand up against biphobia and care about ourselves for once.
The shocking bottom line here, though, is that bisexuals were the canaries in the TRA coal mine. TRAs successfully destroyed any bisexual community and awareness by having the majority of bisexual groups etc redefine what bisexuality meant, to include trans people, and when they were done with that, and they knew that they had won, that was when they started openly attacking lesbians, because they presumed that lesbians would roll over the way that bisexuals did. Thankfully, lesbians didn't, and the fight against that has finally exposed just how predatory TRAs are, and how much they want to destroy sexualities in general to erode consent for their pornsick fantasies.
It's why I personally always see any attempt to discourage bisexuals from stating that they're simply bisexual as pure biphobia.
