Comment by ryan_lane

> Another great point. In my experience, the very best language lessons are from casual interactions when a stranger makes a correction to my foreign language when replying me, but not in a derogatory manner. Most of the time, you can tell they are trying to be subtle and give you a helpful hint.

I disagree with this. I never want a stranger to give me a correction on my language skills. Unless they've been asked to help, they're being rude, even if they don't mean to be rude and even if they aren't being derogatory.

I go back to the point about "how would you feel if someone corrected your english pronunciation". Maybe they're doing it to be helpful. Maybe the rest of your pronunciation is pretty spot on, and they're helping you correct a single word. It's still embarrassing (and embarrassing someone is rude!). Maybe it isn't for you, but it is for most people.

I already have a teacher, and I've asked friends and family to correct me, but I don't want a stranger correcting me.