I tend to get more grief from my own people than from white people about how I speak. It's because of what someone else stated. Even when speaking proper English, you can still tell because of the voice.
A friend of mine (SGRho shout out!
) has a very interesting voice. People think she's a white person or a child when she talks on the phone. When we were undergrads, she communicated with her roommate-to-be over the phone. When they arrived at the dorm, her roomie saw her in the room unpacking and said "Can I help you?" with much attitude! She acted like she was disgusted to be roommates with a black girl.