I don't want someone to come up to me and say, "Your code is wrong; you should have done ABC". I want them to say "Hey, I ran into a problem with your code. I think here on line 123 you meant to do ABC but you did XYZ by accident. What do you think?"
I'm not a dispassionate, disinterested observer. I do have some attachment to the code I write. I know -- and admire -- people who don't, but I'm just not one of them. I like it when someone is polite when they point out my mistakes.