Maybe he's roleplaying a minotaur who's dream was to be a lawyer but couldn't because of his speech so he blames the dark magics that created his race only to be tortured to live without the ability of proper speech. Yet, part of him still wants to tell people what the rules are. :) I agree it's not very rager-like behavior. But to say it's flat out "bad rp" is worse than what he did.
The point is, everyone here is telling him how he should be playing his character. In case you can't figure it out, it's extremely hypocritical. If a zerker wants to try and school an imperial on what rules they need to follow, let him. Then also let him get a lecture by the rager gods on what it is to be a true rager. You thieves are stealing these precious moments from him. Bastards!