Racism towards black has resulted in enslavery, made people think black people are lesser people (even today) and equate them with animals.

Racism towards white has resulted in what? White people not being able to stamp "white" on video tapes or title of TV shows? Call certain people in abbreviated forms?

I'm not saying racism towards white is right, but it's nowhere near the same level. White people are generally not looked down as genetically lesser people. A term like cracker is also incomparable to nigger. The N word is a term you cannot say on national TV or public radio. Cracker is derogatory, but yet harmless enough to be used for name of a kind of biscuit.