I don't know, man. From my experience the only people Mexicans disliked more than blacks were Puerto Ricans and for the same reason.
Mexican blacks have a rough time down there. I met one recently...from the area of Oaxaca to be exact, just like in that Wikipedia article...he spoke , I thought he was either Cuban, PR or Dominican, but his accent was different than those, threw me for a loop...well, he told me that there are not that many, and that they are discrimated against...but, like nobody gives a damn...
I read a Nat Geographic article yrs ago, it was back in 1992-93 and I still have the Magazine. It was about Columbus and also about the transatlantic slave trade...it stated that Mexican slavers preferred that their slaves came from Ghana, because they were easy to control.
What I think also, is that Mexican-Americans, will have an issue with the El Salvadorians, who don't like Mexicans, Mexican-Americans, this is due to the MS-13 factor.... Which is huge...3 dots, ain't no joke.