Yeah, not good behaviour, but in fact he didn't throw his racket and in fact he touched the hand of ZZ though not shaking it.
Touching hands is pretty much par for the course with how the CNT members shake hands with each other. Shaking hands isn't really something done traditionally in china, it's done more as a westernism.
CNT members won't put alot of effort into shaking hands with each other at the end of a match since they both know there isn't any deep meaning to the hand shake for either of them. They might put a bit more effort into it with other people outside the CNT, since they can't know how much it might mean to their opponent. Those two looked like they didn't really have beef at the end. I think WCQ was just frustrated at his own level of play.
That said the bat throw is pretty disgraceful, and I think 3 months is pretty appropriate. If you are going to have a temper tantrum, at least make sure you contain the tantrum so it doesn't get close to your opponent.
You do what you need to do to blow off steam, just keep the effects away from anyone else. That's like basic etiquette for... life... you should have mastered that by now.