Welcome.
You'll find this is a great group of people with great senses of humor. I find myself laughing quite frequently. The imagination and creativity is awesome.
There are also people who need to vent sometimes to get their troubles off their chest. Don't let the get to you (sometimes easier said than done). They just want someone to agree with them so they don't feel so alone.
Others are argumentative just to be argumentative. They like stirring to pot just to wind people up. You will soon be saying "Oh it's him/her again". Once you find out who they are, they won't make you mad any more because you'll already know their game.
This is a great place for stomach exercises though. I find myself laughing hard and frequently that my stomach feels as though it did 100 sit ups.
Enjoy.