I get it. I live in the mid-West. Most people haven't heard the neologism. My parents (well educated, sophisticated people) certainly hadn't.
SV is different.
But culturally where I live doesn't matter. We accept the culture. If SV adopts LatinX, then all Latin Americans will have to adopt it.
Imagine being referred to be a noun that you hate! (well you're a visible minority, so I guess you're more aware of this than I).
We despise -nX. I'm willing to adopt your "Latines" as a compromise. But I'll die refusing to use that X ("X" is dehumanizing, as if we're a mere unknown in an eq.)
This is cultural colonialism from the, typically WASP, urban elite. Who possibly finds Spanish's gendered pronouns annoying? How many are them are native Spanish speakers? And yet they feel slighted and therefore try to impose their (typically poor) Spanish on us!
They ignore that, technically, Spanish has three genders (the neutral which is almost, but not completely, withered away; see "esto/este/esta"). So, even in Spanish, "Latin" would be a far more correct gender neutral form.
They ignore that objects can have multiple genders according to the synonyms used to refer to them.
They ignore that linguistic "gender" has little to do with gender, the term appears to have been coined by Aristotle to refer to sets of nouns, which largely follow gender when applied to people.
Why are on Earth are we accepting of unpronounceable adjectives and nouns (the -nX soup of constants being especially unpronounceable for us native Spanish speakers!)
Outside of the Bay Area tech scene, I can't imagine I would ever use LatinX in Spanish conversation. I choose my battles.