He is just baiting you, the issue he keep harping on doesn’t have anything to do with the case in the supreme court<quoted text>Where is polygamy mentioned in this case? Nowhere.
it is standard opponents bait and switch tactic
he is obviously trying to get you to make a statement so that others can pounce on it.
that is the only reason he is bringing it up
if you have one opinion he will pounce one way, if you have another then it is fodder for his friends who are opponents of same sex marriage.