There was an article published on the LA Times a couple of days ago explaining some of the background of why many Mexicans don’t support Argentina. Unfortunately, it’s paywalled, but the gist of it was that some Argentinian players and politicians have said nasty things about Mexicans in the past, in additional to Argentinians’ reputation in Latin America in general. I’m not saying that what you described isn’t true. I’m saying that there are other reasons as well.

I'm mexican myself lmao. As i said before, there is a massive media campaign to isolate Argentina from the rest of latin america, for obvious reasons as they're being actively butchered by the US. it is true that we've had a rivalry, as we do with many other latin american countries, but that does not change the fact that they're our brothers. You'd have to be delusional to think that the average mexican is going to support Spain (of all countries) against argentina.

Anyway, I had come into this World Cup intending to only support “global South” countries, so to speak, but after learning more about Argentina and Argentinians (from both personal and legit online sources, not social media trolls) I decided to exclude them from my support list. Milei alone is reason enough to not want them to win as that would benefit him. The difference between how Argentina’s leader and Spain’s leader have approached Israel and their genocide seems pretty drastic to me.

If 2 years of Milei and a handful of empty rhetoric speeches by Pedro Sanchez is all it takes to crumble your "support", we really don't want it. and i mean it seriously, this is how one can end up supporting Israel genocidal policies because they're apparently pro-LGBT.