Of course racism is a two way thing. Look at it this way, by definition, racism is:

1.)The belief that race accounts for differences in human character or ability and that a particular race is superior to others.

2.)Discrimination or prejudice based on race

This is from www.dictionary.com so this is a proper dictionary definition. There is no mention of any specific race. This implies that racism is known to come from a minority of each race, otherwise they would have put a spaecific race, which, ironically would class as racism in itself.