Quote Originally Posted by Niwashi View Post
If saying something would make you look like a jerk, that's a pretty good indication that saying it falls into the harassing category rather than the helpful category. Saying things that are genuinely helpful will just make you (and generally the person you're helping as well) look good to everyone involved. Just make sure that your "help" doesn't insult anyone.
People have a tendency to react defensively if you point out that they're doing something wrong publicly. You can do it by offering genuine help and still get that reaction because it was offered publicly and is embarrassing for them.