when the pan identity was first really coined, its slogan was "hearts not parts", in a somewhat controversial and overblown movement against transphobes in the bi community who were... apparently calling transgender a third gender? honestly i wasn't there for all this because it was like. quite a bit before i was born. but it's widely believed that the rumours and stances of these people was vastly exaggerated. of course, "hearts not parts" itself is quite an indirectly transphobic statement to make - it was quickly discarded once people realised that it was a liiiiiiitle fucked up. people had the best intentions, though, and the pan community stuck around - and good for them!
fast forward to a little later (first in the 90s, and then a modern reemergence) and we have the so-called battleaxe bis. these were bisexuals who professed the pan label and community to be biphobic (and sometimes transphobic). now, you may think this is stupid. and it is, lmao. it's literally in the BISEXUAL MANIFESTO that other labels similar to bi should be considered valid. but these people didn't have good intentions to begin with, and in fact originated from a group and ideology you may have heard of.
that's right. it was the FUCKING TERFS ALL ALONG (or, as they were known as in the 90s, political lesbians)!!!
now, just because i can, i'm gonna talk about the exclus to terf pipeline.
the term exclus, short for exclusionist, is most commonly used to refer to ace exclusionists, people who claim that aromantic/asexual people aren't "queer enough". (i will not get into queer is a slur discourse here). these people often become pan exclusionists, and then transmeds (those who believe you have to medically transition/have physical dysphoria to be trans), and then finally to trans exclusionists, or terfs. the existence of this pipeline is disputed by exclus and transmeds alike, but there is so much evidence.
this is getting long but if you actually read this (doubt) i hope you learnt things