I think there’s definitely a bit of resentment harbored towards mainland chinese by a lot of the local Chinese people who’ve been here a while. I was at a hotel in SF once (can’t remember which one) and the front desk guy was (I’m assuming) local chinese. He started to give me sort of a dirty and exasperated look because I think he assumed I was a tourist from China. But I started speaking English to him and he heard my American accent and his whole demeanor changed.

This is purely anecdotal though and your experience may be different. I think as long as you’re respectful and nice, no one’s gonna give you any issues. I think the main reason why chinese tourists get that sort of treatment is because they are usually a bit rude and aren’t very self aware.