Questions about example sentences with, and the definition and usage of "Mexicans"

A: Selena Gomez is half Mexican, so he's saying Selena did the job (sleep with Justin Bieber) that no American would do.

there's this idea that Mexican immigrants work a lot of harder jobs (lots of physical labor-construction, cleaning, etc.), so sometimes people say that Mexicans do the jobs Americans don't want to do.

A: The Mexicans do all the hard work nowadays
Or
Nowadays, the Mexicans do all the hard work
Or
The Mexicans do all of the hard work ✔️ keep it simple

A: I love Mexican women

A: Maybe try saying, "How welcomed are Mexicans in Poland?" Or simply, "How are Mexicans treated in Poland?"

A: It's slang and a racial slur. It mocks white people.