I mean he did called Laos the shittier version of Thailand which didn't sit well with Laotians considering what Thais did to them in history.
Again, my point is, if he has specifically targeted only one group of people then you can make the case, but he has as you have stated targeted other countries/cultures/etc. I am merely saying that his brand is about be offensive regardless of target. So the characterisation that he hates China is unfair, he may have used China as the butt of more jokes but you also have to consider that since he cancelled there already, he might as well.
This is in direct contrast to Namewee where he has directly expressed his distaste. So again and this is for the last time, I am merely saying that this is an unfair characterisation.