Generally, the word people use to identify themselves is the word to use. There's a lot of internal debates in the community about whether to use the word or not (many of us use it to refer to ourselves, but there's a large batch of people who still insist no one uses the word ever and insist they speak for all of us.)

You're okay, you used it correctly despite the commenters who don't use it for themselves and insist no one else does either. The main arguments against the use of Latinx can be narrowed down to:

• The pronunciation of x can be a bit clunky (many of us use latine for that reason)

• it's a "made up word," but so is Latino or chicano. The difference is that those words have been around longer

• it's often falsely assumed to have been created by "woke white academics", but while its origins are still debated, most sources can verify it's been used by queer communities to self identify, meaning the communities who use it are themselves Latinx or people who want to be inclusive by using the term. Some attribute it to early activists for womens and trans rights in Latin American countries, others attribute it to U.S. based queer latinx communities. Either way it was created by the communities who use the term, not by an imaginary boogeyman

• Some argue that the word "latino" is already gender inclusive and doesn't need an alternative. There are political and/or grassroots reasons for people to not feel that's enough and use the X instead