I went to a school when I was a kid where they had "Jump the White Kid" day, where the next white kid who came through the door got the crap beat out of him. This was racially motivated and should be deemed racist. At that school being white did not put you in a position of power (in fact it was the opposite); and the assymetrical nature of racism means that the race that is without power in the situation is the one that racism happens towards. Yes, the school was in the US, but none of those involved knew anything about James Polks aggression's into Mexico, the Zoot Suit Riots or other major acts of American racism towards Mexicans. What they knew was that in their community, where they lived they were the dominant culture, and someone of another race was in a position of racial vulnerability.
In instances such as this, where white is not the dominant culture, then yes it is possible to be racist against white people. Now some will point out that it all takes place in America, but we are not talking about political power and oppression, or job hiring practices. We are talking about a community or locale where being white means you do not have power. I bring it up in reference to this issue because in the story mentioned on this podcast it sounded as if being white on that specific court put the person in a position of being the weaker culture.
And before anyone questions it, I am of a very mixed racial background and was not seen as white (luckily at that school)