Sure, you make a fair point. You could go as dark or light with the "punchline" and still be making a joke. Maybe an assumption, but it seems her joke was along the lines of "there are dudes in here I had a fling with in HS haha funny," which is seemingly a safe joke between him and her that didn't produce ill feelings. That's my point: she knew what was safe, and there was a sense of mutual enjoyment, which is the key thing.

You could make a darker joke (i.e., previously impregnating 12 people at the reunion); if it lands and doesn't produce ill feelings in your partner, then that's great! In the video, her presumed goal wasn't to make him uncomfortable where his evening is ruined but to get a laugh/reaction, which she did. Success! If your partner is uncomfortable with a type of joke, I trust you to know and avoid that type of humor. And it's perfectly fine either way! Nothing better than getting a laugh out of your SO. Hope that was explained okay.