Because I have seen Puerto Ricans and Cuban range anywhere from white and black and your general Hispanic look while as most of or the majority of Mexicans look brown with a few white ones but there like in 10% tile.
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There is more racial diversity in their gene pool.
Mexicans tend to be either: mestizo (white/AmerIndian mix), AmerIndian, or Spanish white. there was a tiny tiny black population sent to Mexico in the 1800s but they kind of absorbed quickly into the population and their genetics don't show up very much in the people. majority Mexicans I've seen are mestizo.
PRs and Cubans tend to be either: mestizos, mulattoes (white/black mix), triguenos (white/black/AmerIndian mix), Spanish/Mediterranean white, or AmerIndian. well at least I know PRs are taino Indian, I don't know what or if Cubans have any native influence. most of the Cubans I've seen are on the mulatto sliding scale, some look more Spanish , some look more black and some look stereotypically mulatto.0