I think because most of the Latinos in the US tend to come from Mexico, that is who is most associated with being Latino (especially in the western US). Florida has many Cuban, Puerto Rican, and even pockets of Dominican Republic immigrants, so our view of who is Latino is broader.
I know that in every place in the world people are prejudiced against some other group. The title of the thread made me think you meant the United States ("America" usually means us). I do know that groups of Latinos are prejudiced against other groups of Latinos. Heck, I had Mexican neighbors, and the husband was proud of being more Spanish than his wife, it was weird.