No, Puerto Rico is not a state, but it is a possession of the USA. It's an American territory. In any case, Azizi is quite correct that it's people who fear those whom they see as "different" who are zenophobes, and only a zenophobe could possibly be disturbed by the thought of someone singing the USA national anthem in Spanish.

Some English people in Canada get pissed when they hear the national anthem sung in French, and some French probably get pissed hearing it the other way around, and the reason is simple: in both cases, they are zenophobes with a chip on their shoulders. That's nothing to be proud of.

It ain't nothin' to get upset about, and it harms no one.

It's just like little kids beating their fists on the floor and screaming, "I want you all to do it MY way!!!! Waaaaah!!!!"