Good god it's spelled "to," "too," or "two."

But anyways -- IMO Perma ban was out of the question. You forgot to take into account the second line of the rule:

PERMA BAN
""This is the highest punishment a player can receive. It can only be granted by a relatively small number of Upper Level Admins. Perma bans usually require a demo but always require that the player in question, beyond a reasonable doubt, committed an offense against the server and or community"
Stay away from perma bans unless 1) they are obviously using hacks and you record a demo of them doing it, or 2) they are causing the server to crash or are seriously compromising the server in some way (with a demo). The fact that he was being a general douche does not allow you to ban him permanently. Leave it to Zero to ban people retroactively and don't take it into your own hands; it's not your place to do such things.