You can use the LGBTQIA+ Wiki if you're curious about a term, for instance: https://lgbtqia.wiki/wiki/Genderqueer
Yes, I said most for a reason: gay, lesbian, bisexual, pansexual, and asexual (5 out of 8, a majority) are sexualities.
The other three are definitely not: Intersex refers to physical sex traits, and the other two (transgender and genderqueer) do actually relate to gender identity in some way.
If it weren't for the ableist framing, Redditor being in the illegitimate category is a take I would agree with.
The Coke vs. Pepsi part by itself could easily have been reposted with the title "Ah yes, the two genders" as an ironic trans meme though