See, that's the whole thing right there. They don't want tolerance, they want APPROVAL. They feel so completely threatened by people saying "we celebrate the marriage of a MAN and a WOMAN" and when they hear that, they go all to pieces.
It's like people who insist on wearing dirty clothes and not bathing feeling all upset over a bunch of people who say "we like being clean, and we like wearing nice clean clothes." Being clean is a choice.
They want Oranges to be called Apples with no change in the term used to describe Apples.