Just as important as knowing how to take criticism, of course, is knowing how to dish it out as well. And the number one rule that I’ve tried to stick to is don’t be a dick.
You just have to try to remember that all the time, there is a person behind that thing that you just experienced, who might not be able to distance themselves from that thing that they made. And especially if you’re leaving a comment on the internet, they will likely see it, they’ll take it personally, and they’ll feel bad, and you won’t have helped anyone. I just see it so often, when someone is trying to give good advice to someone else but they’re just not going about it the right way.