This is blatantly false, because in southern states wealth and color of the skin is more related due to historical colonialism and lack of social mobility leaving indians and their descendants with an slave syndrome.
In the north, where most white mexicans are, you wont see that association between white = rich and educated in the people mentality because
a) the north was populated by poor europeans, war refugees and people looking to make a living.
b) the indians in the north were never conquered, the spanish had to buy their way in or simply avoid the indians. So the indians in the north dont have a slave syndrome.
EDIT
LOL at the guy being "white" light skinned doesnt means white, it means the guy has an office job, if that dude was working in the fields he would get really dark, he has an asian face which means a lot of native heritage.