I dont really care if you use the term bisexual or pansexual, but what i DO care about is that you understand that bisexuality at NO stage in history was EVER trans-exclusionary. Bisexuality has always included trans folks, and non-binary folks, and the entire spectrum of gender between male and female, as well as Definitively Gender and agender. It has ALWAYS meant "attraction to more than one gender." It has NEVER meant "attraction to cis men and women only."
So, pan, bi, use whichever label you will. But do NOT buy into the recent-years innacurate concept that bisexuality is attraction to cis men and women only, because thats literally never been the case.
^^ Like. Its literally right there in the middle of the flag.
And by contrast, this is what the pan flag colours mean:
So literally its just......
bi colours = "same gender, opposite gender, and other genders"
pan colours = "men, women, and nb people."
Those two things are...... not all that different to each other.
The purple has always, literally since the flag was created, meant "more genders."
And bisexuality included "more genders" in the definition before the bi flag was created, too. Thats why they included the purple bar in the first place, because it was reflective of bisexual people's attraction to and relationship with gender.
If you feel that pansexual suits you better, or you like the pan flag more, then thats fine -- but don't spread the misconception that bisexuality is remotely exclusionary. Because its literally never been.