Christine only hates on people on the basis of looks. I find it laughable how she's constantly tearing down Amber and Brittany's looks when they are so clearly more attractive than she. She's just a really hateful bitch and I'm guessing it stems from insecurity.
To hear her tell it, she's so hot that she's able to speed around town and talk her way out of parking tickets because she's just that hot. I think all her shit talking comes from malice, plain and simple.