I was reading a book on social life of the upper-middle class and new rich of the American 1920s and realized so many things we now do proudly were considered socially taboo back then. This was especially the case for clothing, makeup, women in certain public spaces, etc. What do you think will be different in the 2120s? Or maybe even the next 50 years?
I’m neither so take this with a cup of salt:
Originally they were the same. Pan (and some others) faded from use and was largely forgotten.
When it first came back into use, there was a lot of “you’re attracted to both genders; we’re attracted to all genders” but this got a lot of pushback as being bi-phobic because it paints bisexuals as being transphobic (although if you really think about it, the accusation that this is transphobic is itself transphobic as it implies trans people are not included in “both genders”. Perhaps enby-phobic would have been a more appropriate accusation).
These days the generally accepted distinction is that pansexuals are attracted to people regardless of gender, as in gender plays no part, as opposed to bisexuals who may (or may not) be attracted differently to different genders.