If it's any consolation, such teachers aren't usually student-favorites. Apathetic teachers are boring, while teachers with angry energy or who use their position for powertrips (as MAGA enjoys doing) make kids uncomfortable. It's the teachers with patience and open minds that tend to be the most influential and remembered. If your mom acts the same way at work as she does at home, it's hard to imagine the kids would choose her (out of everyone) as their role model.

As a non-American, what's the irony here? Mexican beer?

If so, I think "those types" have no qualms about Mexicans existing as long as they produce slightly cheaper goods and good beer in their own country - they just want the ones in the US to all die as soon as possible.