#tw enbyphobia

When you say two things are different, and you specifically state one thing has a certain feature, you are heavily implying (if not outright stating) that the other specifically does not have that feature.

If you say Box A and Box B are distinct, then describe them:
Box A is 6″X6″X6″ and made of cardboard;
Box B is 6″X6″X6″, made of cardboard and purple”
Then (based on the information) Box A is necessarily not purple. If Box A was purple, they would not be distinct.

If you say pansexuality is distinct from bisexuality, then describe pansexuality as “attraction to all genders (inclusive of trans and NB people/with no gender preference/with no focus on genitals/with focus on personality/etc.)” then the implication is that the opposite is necessarily true of Bisexuality.

You’re saying bisexuality necessarily excludes trans and NB people.
You’re saying bisexuals necessarily have a gender preference.
You’re saying bisexuals necessarily focus on gender/genitals.
You’re saying bisexuals necessarily don’t focus on personality.