I want to respond to the "racism means believing one race is superior than another race" to justify that black people (or other minorities) can be racist against white people. There are several things wrong with this. First of all, if we take a look at all definitions of racism (from sociologists, philosophers, race theorists, etc), we find that racism is an assertion of social power over another person. If we look at the dictionary, we find the most common definition that white people use to justify that minorities can be racist. Interestingly enough, white people have created and edited most dictionary definitions of words. Noah Webster, creator of the Merriam Webster dictionary, was, you guessed it, WHITE. So while sure, you can use the dictionary definition, it is much more useful to look at current scholarly literature about the subject.