"Productive" is a judgement about tactics that like-minded people can disagree on. Calling someone a bigot isn't an indictment of their soul or character or motivations. It is a shorthand for describing their actions. Mormonism frequently works towards and supports discriminatory policies, and so can reasonably be described as bigoted.
They can individually act differently, but if you're associated with a politically active abrahamic religion you're gonna have to carry that cross, so to speak. No one owes anyone the benefit of the doubt on this.
No, I simply don't accept that politics is preference. Politics is in some ways the physical manifestations of our values into the world. They affect people in real and profound ways.
A "preference" for the subservience or disenfranchisement of certain people, for example, is no mere preference.
I actually agree with what you wrote, but it’s interesting to note that many fewer people believe in universal values.
Many now believe that values are a preference (this is not something I believe, though, as I believe in objective morality, with the caveat that I realize it’s just a belief, like a belief in angels or something).