Get used to it, Whammy. The best thing to do is to read the original post and decide if you want to reply to it. If there's tons of posts, read the most recent 5 or 6 and reply to those if you like. Just make sure you don't step into anybody's personal argument unless you've got something valid to say. Then expect return fire. Just don't take it personally. A lot of people use the anonymity of the web to do and say things they normally wouldn't do or say in person.
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I may not agree with what you have to say, but I will fight, kill, and die for your right to say it.