Instead of "hyena laughing", he could maybe go, "Wait, wait, you actually did that? That's how you hired women? That's pretty fucked up, you know that, right?" and then start having a tough conversation about it.
In point of fact, it is perfectly possible to ask hard questions without being judgmental. It's objectively wrong to deny employment to a woman just because they won't blow you, but if Rogan is as skilled of an interviewer as so many people paint him out to be, then surely he is capable of approaching the subject with tact. Give your guest the space and the comfort to feel open with discussing their past experiences and how they may view them now.
If, however, they end up feeling shame and shut up, well - that's on them.
Unless Rogan is secretly operating the world's longest, most elaborate public sting operation, I don't think the "let 'em hang themselves" argument really holds water.
A decent person would waste no time talking to a person like that to begin with, let alone give them a massive platform to be heard far and wide.
Seriously, what do you expect him to do when someone says something like that? Immediately end the broadcast and summon the police? What exactly do you think shows like this are for?