As a person who has learned 2 languages besides English, let me say the idea that you would go into a place where native speakers are discussing their own language and then tell them why they are wrong because non-native speakers wouldn't see a problem with the usage of the word in their own language...?

Certainly gutsy, I'll give you that. I can't imagine the balls to tell people speaking their native language that I, a student of their language, am learned enough to educate them on the subtle nuance of the use of a word in various contexts, but you do you I guess.