If someone acts aggressively towards you on the forums or, in your opinion, isn't playing by the rules, then don't overreact. If they really are going too far, then it's more likely he/she will suffer any consequences. If you lose control, the chance of continuing a sensible discussion is severely decreased. The thread often deteriorates into an flame war which is not in anyone's interest.
Just an extract from the forum rules.
Let's keep all post on topic, otherwise this thread will lead nowhere