It's just flat out racism. People are racist to white people. It happenes, a lot actually.
There I said it. Bash away.
*edit to add*
Me being irritated that I was taught in school, and my son has been taught that racis, towards white people is not in fact racism but "reverse racism" like, we are some race-less people who are free game does not in fact make me a racist. I hate racism of all types.