Chinese from hong kong in the state

I have met some Hong Kong people since I came to the state. I am happy to make friend with them. However, some of them talk really strangely. I am not saying I do not like the way they talk, but they just talk to people in an impolite way. Again, I am not saying I am a VERY polite person, but please just remember to have mercy when you talk to people. We may talk a lot of nonsense stuff which does not involve any subject any person, but nobody likes to be told something which makes him/her not even know how to reply or react at that moment. That is really bad... I feel sad most of my Hong Kong friends are like that, except those I hangout and have dinner with a lot. I will keep my point still, "The first one should be changed is me, then people will be changed~"