Best thing I’ve read all day: On Politeness, from Kill Ten Rats:
It is very important that you speak well, especially online, where text is your voice. Whenever possible, you should type in full sentences with correct spelling, capitalization, and punctuation. Be polite, being sure to spell out please. Avoid profanity. Be seen to express courtesy and give others the benefit of the doubt. Avoid not just drama, but dramatics of any sort that might distress others or give them the impression that you are an immoderate person.
That way, when you call someone a stupid douchebag, it will mean something.