There's considerable debate about the -x ending, both in this community and in the Latin American community. Some like it for its sense of gender inclusion, but it doesn't naturally fit with the languages it's applied to and some see it akin to colonial rule over their language(s).
I don't have a dog in this fight, as I'm not from any of the above communities. But some people feel very strongly about this topic and if you're unaware of that context, you might end up in the middle of an argument you didn't go looking for.