As the most prominent Mormon on this board, I will be glad to discuss this.
First, Mormons do not hate black people. That's absurd.
The first origins of blacks being "cursed" is in the Bible, not the Book of Mormon. Noah's son Ham was cursed and denied the right to bear the Priesthood. Ham's wife was Egyptus, who had dark skin, so the lineage that had dark skin were denied the privilege of being ordained to the priesthood.
Now, in the Book of Mormon, God cursed the Lamanite people for their excessive wickedness so that others could distinguish them from others.
It's important to note that the descendants of the Lamanites are not ethnically African (Black people) so saying the Book of Mormon talks of a curse about black people is completely false.
At no time in Judeo-Christian history since the time of Noah has a black person been allowed to be ordained to the Priesthood until 1978, when the LDS (Mormon) church announced that God has given the approval to ordain all worthy men, regardless of ethnicity, to be ordained to the Priesthood. In this case, the LDS Church should be commended for restoring this privilege, not condemned.
There have been many black pastors over congregations of different denominations, but none claim to possess priesthood authority, and some even teach that it isn't even necesarry, which is explicitly contradictory to the Bible's teachings.
The fact that your early ancestors were denied the Priesthood is not grounds to assume that just because of that denial, that you are considered a lesser human being and any less loved and important in the eyes of God.
My Uncle lived 2 houses down from me, and I had 2 adopted cousins who are black my same age that I grew up with, so I grew up color blind and have zero prejudice towards anyone because they look different than me.
The church clearly teaches that we are to treat everyone kindly regardless of their race, gender, religious affiliation, sexual orientation or otherwise.
The fact that an individual would do otherwise is in clear violation of the commandments of God according to the LDS Church.