yes you can be racist towards white people. racism is when you're biased to a certain race and being white is a race. and you saying that others should never fall in love with white people, you're being bias towards a whole race. thats racism.
also, just because you had a few bad experiences with white people dont mean that the entire race is like that
that reminds of something i saw on an article awhile ago; a young white boy was walking home from school, and a man in a vehicle passing by shot him dead. if he was a black boy, or any other race, it would be on every news channel and everyone would be talking about it. murder is still murder. racism is still racism.