Mormon teaching is racist - all xian teaching is racist - Mormon anti-coloured teaching is a product of xian 19 century racism. Mormon weakness was simply not changing the rules as quickly as other more racially progressive religions. All xian teaching continues to be racist as long as it cites the bible and the concept of God's people seperate from those not of the body of Christ. All religions aim to cause as many divisions and points of difference as possible.
The entire OT privileges one 'race' (Israel) above all others, the NT carries on the debate ( Jews v Gentiles) and fudges an answer allowing gentiles to be adopted into the house of Israel. The bible talks of the curse of Cain which many early christian thinkers associated with a darkening of the skin. This awful interpretation was part of the justification used by xian slave owners. Many protestant churches refused to ordain coloured people until the 60s and in places in Southern US some Catholic churches also refused to ordain colured men.
While the fight in most western religions has been won regarding race (and the Mormons have disavowed their teachings as well going so far as to alter their scriptures) the discrimination against women and gender preference is still ongoing. If you wish to condemn Mormons and certain sects look to their view on gender roles and sexual behaviour - I would suggest.