The funny thing is that it's so easy to see this behavior in others, but not in ourselves. One of my kids can not stand the younger sibling being wrong. Doesn't matter if it's a sloppily pronounced word, a statement that isn't factually accurate, or a simple mistake. It has to be pointed out. I've torn my hair out about it -- until little sister finally said, "look -- you need to stop being a bully. I have a right to my opinion -- even if it's wrong!"
So that's our motto now, when we hear someone say something utterly stupid: "Remember, children, they have a right to their opinion -- even if it's wrong!"
And it actually has cut down on bigger kid's Correctomania.