What he did is written on Wikipedia in detail.
See the page, if you want to know the incident
http://en.wikipedia.org/wiki/Kong_Qingdong#Insult_on_Hong_Kong_people
Kong commented on a viral video in China, in which a mainland Chinese mother on a Hong Kong train engaged in an argument with a fellow passenger, a native Hong Kong resident who tried to stop her son from eating on the train. Kong lashed out on the Hong Kong passenger, calling him a “colonial elitist”, as well as claiming multiple times that “many Hong Kong people are bastards, dogs, and thieves”
I can't understand why he thinks those who just keep good manners are colonial elitists. And, how to keep good manners depends on country or area. Even if eating in the train is accepted where he grew up, Hong Kong residents don't have to obey the rule.
The reason why he never mind eating in trains might be that Harbin, the place he was born in, don't have subway systems like those in Hong Kong*1. He hasn't had a chance to know the rules in subway trains.
In his video, he also compared the relationship of Hong Kong and Britain is similar to that of Taiwan and Korea to Japan.
What's the similarity between the "relationship of Taiwan and Japan" and "that of Korea and Japan"?
He seems to be irritated only with First World*2.
The incident proved that he is just a communist and don't have consideration for people whose cultures are different from him.
