I have lived in Asia for 10 years in the past and now play often in California at casinos that are dominated by Asian players. They are often very critical of eachother, and moreso when they both speak the same language. One Chinese guy telling another how to play is common while the same Chinese guy might just give a Korean player a dirty look.
Now if you sit at a table with several Asian players who speak the same language and your proper play costs the table, they will eventually ridicule you but never in English. Learn some curse words in Korean, Mandarin and Vietnamese and you will find your ears perking up from time to time.
Overall, they are not very different than Anglo, Hispanic, African American or any other kind of ploppy you might have out there. A little quieter amongst others but they, like all ploppies have perfect hindsight when things go wrong but never noticed when they go right.
Just played recently on a table with two young Chinese exchange students of some sort. One knew how to play and his buddy was the perfect casino customer. When the guy who knew how to play did things like split his 3,3 vs 7 and doubled his A,7 vs 4 and both backfired his friend got so mad and so loud that the casino had to tell him to calm down. His friend had made similar proper plays just a few minutes before but because the loud guy won on those hands, he had nothing to say. The result was that his friend began playing as poorly as he did.
Since I did not need the noise or an extra player on the table, I was waiting for one of those kinds of hands just to see if I could get the loud guy off the table. Eventually I got 9,9 vs8 and split. The result was great (for me), I win both but the loud guy loses and hindsights it that if I had stayed he would have won. Says something to his buddy in Mandarin after making a loud grunt and leaves. Being the character that I am, I ask his buddy if his friend was complimenting my blackjack skills----I get a laugh. Point is that the differences between ploppies of different ethnic groups are not really big differences.