man I have that issue but it's not (just) me being an asshole I actually just suck at remembering that people have transitioned

Interesting! It's based on the subject's gender. In spanish, human is male and person is female as well, but we don't have a third gender.

The joke is:
Non-binary refers to people not identifying with either being exclusive male nor female.

The post shows someone asking ChatGPT what this is called in spanish.
As spanish seems to have gender for nouns, this defeats the purpose of being neither female/male.

A non binary person would be "una persona non binaria", which is a gendered word, female.

It partially makes sense. Non-binary in Spanish is gendered depending on the subject. But it is not a real gender. Person is "female", human being is "male". But they are generic words

It's an adjective so it must match the gender of the noun before it. So if you want to say non-binary person, since person is femenine, you'd say "persona no binaria". Unfortunately, however, most nouns change gender depending on the gender of the person referred to. So you can't say non-binary gardener without resorting to "made up" grammar.

Imagine if you’d asked it for a vegetarian recipe and it asked if you wanted it to have a chicken or beef base. It’s sorta like that

The joke is that someone who is non-binary doesn't identify as male or female, yet Spanish is a gendered language and thus ChatGPT provides male and female forks of the word "non-binary".

In Spanish, everything is gendered, usually descenable by an -a or -o ending.

So Spanish requires you to pick the male/female linguistic gender to refer to a person in order to say that their gender doesn't fit on the male/female binary.

I believe Spanish speakers just resolve it by using -o by default, because linguistic gender is not identical to social gender.

It's roughly like if English made you say "they're masculine-non-binary".