A joke? Not at all. You seem to be saying that, if one set of people exercises a right, than that can adversely affect the value of another set of people's rights to do something similar. I have a right to drink a beer (or quaff a cider) and someone else has a right to their opinion of that action, but not the right to tell me I can't. Exactly parallel to that is the right of a homosexual couple to get married and the right of somebody else to their opinion of that action. However, the marriage of a homosexual couple has no effect whatsoever on the validity of a heterosexual couple's marriage or on any rights that marriage gives the participants. One person's rights should end where another's begins.