>>508636868 (OP)Tell them they don't speak Spanish correctly.
None of them do, they basically speak in the equivalent of broken ebonics when they speak Spanish and hearing actual people in Spain speak the language is almost incomprehensible to them. But in addition to that 99% of Mexicans are just LARPing to be obnoxious. If you ever meet a Mexican IRL and watch them try to speak Spanish to their family they'll tell them they're saying everything wrong and eventually they'll be forced to switch back to English. It's their secret shame.