Jewish people have been particularly insulted in the last few years, because the Mormon Church obtained name lists of many of the murdered Holocaust Jews and starting calling their names out in their ritual baptisms for the dead. The Jewish surviving families said they'd suffered enough from Gentile religions and didn't want their family names to be used in Mormon temples.
You can find information on the mormon baptism of Jews at this site
The Issue of The Mormon Baptisms of Jewish Holocaust Victims
There is a website called the "Do Not Baptize Registry":
From the site: "The Mormon Church (officially known as The Church of Jesus Christ of Latter-day Saints) takes it upon themselves to baptize everyone, that isnt already a Mormon, into the Mormon faith after they die. They do this by physically baptizing a living person in the name of the deceased.
This site is for those that do not wish this service to be performed after they die. This site does not represent the Mormon Church so we cannot guarantee that those wishing that this service not be performed will have their desires granted. We are merely gathering a large list of names to submit to the Mormon Church to humbly ask that these baptisms not take place.
The Mormon Church has, somewhat reluctantly, granted this exemption to the Jewish Holocaust victims. We merely ask for the same exemption from having this service performed on our behalf."
At least a person can make this protest on behalf of themselves and their families, whether it's ignored by the mormons or not.