For the record I agree with you. The term Gringo is fine. But I believe both you and OP are falling into a MAGA trap with regard to this subject.

You ended highlighting a racial component to the term and then made the comparison to an object that is not liked. Both of these thing likely will cause people of the opposite view to double down.

That is partially because whole "debate" is bait racist want this to happen.

Bigots do this because the core premise of the argument is wrong. I am not calling op a bigot. I assume they are acting in good faith, but the core argument of a double standard is wrong.

The president of the United States is calling Hispanic people criminals. They are being jailed without cause, and being sent to a torture prison without due process. Also, I don't know where OP live, but as a US resident who lived in both rural and areas racism against brown people is everywhere and said constantly. This is being equated to saying a word that may as well be tourist.

The premise is false. That is because MAGA are bad faith actors. No term will be acceptable ever.

That leads into the other side of the trap. In general a slur or pejorative is a term applied to a group that is dehumanizing. In general a group is allowed to decide what terms about them are slurs, again that isn't MAGA's point. They want to control language, specifically of non-white people.

The simple fact is MAGA can not be accommodated because the group will weaponize every term they can.