Sorry man. I'm a hispanic myself, but I recognize the way the wind is blowing.
Here's what's going to happen. A bunch of upper middle class white liberals like the LatinX word and since media caters to that demographic more than anything else, it's going to be what's used. When people point out that it's white people imposing a change on a language not their own, they'll trot out the 1 in 100 hispanic or latino token they have that says they like the term "Latinx." People will scream and say it's retarded, but they'll enforce draconian speech codes that demonize you as a racist if you don't use it. And 20 years from now, out of exhaustion more than anything else, it will be the new term.
Yes, it's outright cultural imperialism. Yes, it's insufferable, because it's perpetuated by the least self-aware people on the planet who would scream bloody murder if it happened in a context they didn't like. Yes, it's terrible and unfair. And yes, it's going to happen.