I think what you have to do is stop and think before you type whether or not you're angry at the person writing or the ideas they're presenting. My opinion is if you think their ideas are shite, and you tailor your language as such, then.... full speed ahead! But only if you can back yourself up...otherwise you're opening yourself up for the same treatment.
If you find you're angry at the person, maybe it would be worth exploring why you're feeling so hurt or hostile before you post anything.
If you find you're angry at the person, maybe it would be worth exploring why you're feeling so hurt or hostile before you post anything.