† To be fair, I was involved in almost all of those examples, and thus am far from impartial. Honestly, in at least one of the cases I was one of the offending parties. That doesn't change the fact the behavior is childish and that it's condoned by the community.
†† I was really torn about this one. It's a really solid answer. However, the user just comes off as pedantic and rude. I personally would rather someone just tell me to RTFM rather than have them say the same with 100 words and follow it up with a "Don't thank me." Then they couldn't refrain from commenting to make sure everybody knew that they were not incorrect in their answer.