Hmm, I don't think Mainland Chinese call other people with Mr as honorific. We are more used to use titles or positions held by the person, like Manager, Presid

Hmm, I don't think Mainland Chinese call other people with Mr as honorific. We are more used to use titles or positions held by the person, like Manager, President, or the like. If it's some stranger you met on the street, master (师傅) is most likely used. I've only seen people in Hong Kong movies or TV shows calling their boss Mr (生 rather than 先生). I think they actually do that in real life.