It's kind of funny. Normally I dislike a brutal MC, because they're usually just assholes. This MC though, so far hasn't really been that way for no reason. People keep saying he's crazy and violent, but so far he's just returned what people have given him. If you attack someone, you should be prepared to be beaten up instead.
He's also quite intelligent, thinking things through. He may seem like the berserker type, but he has a good grasp on his own level and what he's capable of. He also isn't as rude as the characters keep saying. He uses taunts against opponents, sure, but in day to day stuff he's usually pretty normal, if a bit casual. He will be a bit rude if pushed, but that's acceptable.
One example of this is the girl who keeps asking him to train her. The first few times she asked, he said no, and I don't want to, but after she she kept pushing, THEN he started being rude to get her to back off.
Also, it's always acceptable to be rude to paparazzi, that's just a given.