I recently had a taxi driver cuss us out because my wife is Thai and he thought she was chinese, since chinese tip better he says, and taking Thai's is a waste of his time, wouldn't stop being annoying and complaining how we weren't going to tip big. My wife said, well I wanted to get grab originally, and he said good next time get grab and don't bother him. Also complained how we used meter since he could charge more for foreigners