What's bad about racism?

Many things are bad about racism. we are free now no slavry no nothin, but yet we treat each other like we are lower or better than each other and you know what nobodys perfect we are all diffrent in our own ways and one of those ways is skin color but we are all human, so rasism is wrong because no matter what your skin color is you should be treated like a human, not a slave and one thing I wanna say rasim is not only towards black its towards anyone that is not your own skin color they could be black mexican or whit it dont matter rasism is rasism and rasism is terrible

A literal meaning of racism is 'discrimination'. It is you who decides what is good and bad. But, racism is superiority of one race to another so, it is bad as equality must be preferred instead of superiority if humanity is concerned and also because it is morally wrong.