Final-Fan, his post started with "This site is a joke." That's not a criticism, that's an insult. He started bad, he ended bad. That's all there is to it.
To be fair there are a few people who have said similar things that have not been banned. I've read the forum rules several times and there are a few people who regularly make posts in contradiction with rules #1, #3 and #4 and they haven't been banned. You know, just saying.