To me, the saddest thing is when an 'expert' corrects your tune, words, style...whatever... in a boorish manner and is right. I have known several quite knowledgeable people who really DID have a wide range of expertise, and were often able to sing and/or play the song as well as anyone in the room, but had a limited concept of politeness.

**It is one thing to know you're right, and quite another to know HOW to be right.**

I am often happy to be shown (later) a better tune, or alternate words...etc. Then, *I* have the choice of whether to change or not. What I will not tolerate though, is someone demanding I do it another way, or trying to 'helpfully' sing it 'right' louder than me.

I am not a 'performer', so this doesn't happen often, but I have seen it done to some very nice folks who were performers.