It's the internet, you have to understand that for the most part, people aren't being "mean" to you. It's difficult to convey tone of voice and sarcasm with simple text. Many times what you may be reading as negative and hateful comments are nothing more than good-natured poking fun at each other. I talk to people on the internet the same way I do my friends, with a bit of biting sarcasm, but none of it is meant with any negative connotations.
The fact that you say you are leaving this forum for another tells me that you haven't been on many forums. This particular forum is one of the friendliest, non-hostile, and welcoming forums I've been on. You can try other forums, but I can almost guarantee you they won't be as welcoming, and you will get even more sarcasm and perhaps even some genuine negative/hateful comments.
Just remember this is the internet, the land of anonymity. Just use this experience to "thicken your skin" a little bit and learn not to take ANYTHING you read on the internet too seriously.
If you are genuinely getting *angry,* as in, increased heart rate, thinking about what you read online even while you are offline, allowing the stress to spill over into your interactions with "real" people, etc, you may want to consider finding an alternate source of information than internet forums or perhaps even seeking professional counseling. Just try to keep the internet and your emotions separate and you should be fine though.