One thing a few need to remember:
And if you feel someone is abusing the negative rep feature report it. Neg repping the same person over and over for no reason other than wanting to toy with them, is against the rules. ThanksRep System Guidelines:
Our reputation system is designed to provide a feedback and credibility mechanism. Abuse of the system (repeated neg repping of the same person without cause or positive rep "trading" among users) will not be tolerated. Rep system abuse will result in warnings to cease. Continued abuse will result in random acts of rep manipulation of abusers by admins. Abuse the system, and we will mercilessly toy with you.
Sure it is!
Do it, and they report it, and we find that you are neg repping them for no reason and you will receive a warning etc. We don't do anything if you don't report it.