Point 1: See above, Kisha and Jen never made a mention of their race, Margie was the only one to bring that up.
Point 2: Sound bytes are a wonderful thing. I can't imagine T/V saying that they knew Chinese that many times, more likely they said it once or twice and the sound byte got used over and over again.
Point 3: Yes, that was annoying. But you do what you can to get ahead, even if it means appealing to patriotism that might not even be there.
Point 4: That's just silly.