I can't stand negative people, in particular, people who criticize without offering suggestions.
My step-dad CONSTANTLY does that, like this morning, "that bookshelf doesn't look good there" "ok, where should it go?" "I don't know".
If you're going to say that you don't like something, then make sure you have a better idea first. It drives me crazy when people offer non-constructive criticism.
That's just something that's on my mind