You sound power hungry, You can't force your power on others because it's your server and banning them for that reason doesn't justify abuse.
actually no, he caused problems related to the server against me, he is making a big deal over a shield, if he didn't log out and block me, this wouldn't be happening, he made this come upon himself.
sure it is for interpersonal reasons, but if he is a dolt to me, he obviously don't respect me so he shouldn't have the right to play on my server, I will unban him but if he pulls stuff he gets banned forever, and there will be no unbans.