Why do Mexicans and Puerto Ricans hate each other?

[Puya]

It is just a boxing rivalry!!!

Mexicans who live in Mexico and PuertoRicans that live in PR don't hate each other neither.

The only wars I see are the ones that live in the states PRs and Mex. And the worst part is that they know so little about the country they said the are from!!!!!

[Rickety Cricket]

By looking through NSB and this thread it seems like its just a boxing rivalry which led into more hatred towards each other because of it. Definitely seeing that now because of last weekends fights.