It seems that members of minority groups are prejudiced against other minority groups, and since they don`t suffer from the famous "white guilt," they don`t restrain themselves from saying so.
There`s also, if you read the post, an instance of a genuinely bigoted white teacher, and the fact that he hasn`t been fired shows how powerful the teachers unions are.
Let`s say a Taiwanese teacher of Chinese shouts in front of God and everyone "I hate Chinese," and proceeds to denounce the majority of our Chinese-speaking students as shiftless commies. Let’s say she treats them as such and manages to stay in the system until retirement.
Maybe a teacher posts on the board an offer to write college recommendations for 50 bucks a pop. Let`s say that teacher is from Spain and regularly tells Dominican and South American kids they are ignorant and don`t know their native languages. Let`s say further this teacher makes disparaging remarks about their parentage, of a most unpleasant and vulgar variety.