Most bigots are tolerant. Most people (in the US) who think homosexuality is a crime against God, a sin, wrong, or just gross are tolerant. They will keep their opinion to themselves and they can be friends, neighbors, coworkers with a gay person with no issues.
People are weird and complicated. It just isn't the case that someone who is against gay marriage is "against your right to exist". Tolerance is putting up with things you disapprove of not approving everything.