I'm the same way, Chris. I'm a total buttinsky when it comes to manners. I don't try to embarrass kids or anything--I realize I don't know the backstory, and there could be issues I know nothing about. But I do quietly suggest alternate ways of handling things when bad manners are evident.

I'm afraid I can't help it! Call it "positive peer pressure," insofar as "peer" = another human being who has to share space with the child.

Kriston