[Cloverfarm]

dark-skinned vs light-skinned Mexicans ...

If you really want to hear some nastiness, check out how light-skinned Mexicans treat south Americans like people from Guatemala or Honduras.

Not pretty.

[Eric in the Ozarks]

We've visited Oaxaca, Mexico. Everyone there is 5 feet tall and brown. Most speak a local dialect, not Spanish.
They are considered children by northern Mexicans.

At the same time, a friend from Puebla is dark but tall and has a Masters degree in Chemistry. He rolls over this discrimination with humor, (”I'm from Tiero del Fuego...”) is one of his opening lines.