Well it happens quite a lot, as I said it happens to other capable Chinese speakers too and it seems to go up for me the more American I look IE if I am wearing a baseball hat and sunglasses (even though I am not America). There's a segment of the population that doesn't like to speak Chinese to Westerners, that's it. They be mumbling some crap back to me instead of talking normally in Chinese because they are too busy looking at my white face and thinking of something to say in English instead of listening to what I am actually saying. The white face clicks the switch in their heads that says must...practice....English....now....
There are of course other cases where the listener can't understand the strong accent or the bad tones or has poor situational comprehension skills (the last one being most service staff here).








