It's a tasteless joke said to specifically make people laugh at how offensive it is. Its tasteless, offensive, but Momoa isn't assaulting women, so I think people need to chill out lumping him with Harvey Weinstein for gods sake.
Again, dumb joke, bad joke, offensive, but he literally played a barbarian rapist on the show, and he answered yeah it's awesome I play a barbarian rapist. He himself isn't one, and he's not condoning it.
If the guy who played Freddy said, "Best part about being Freddy is I get to kill all those dumb kids!" yeah, dumb, but we know he's not an actual child murderer nor is he advocating for child murder.
It's bad, we can tell him it's bad, it creates a negative atmosphere against women, but let's put it in perspective.