In that context, HN consensus on downvoting jokes makes more sense. I like a good joke, but they belong on the bottom of the page after the "serious" conversation. It's unfortunate that it's overloaded with karma, but complicating the upvote/downvote system has other drawbacks.
Unsurprisingly, I’ve found levity is best received when incorporating a kernel of fact or observation. Also, timezone matters.
Jokes are easy. Comedy is hard.
That being said,it does take skill to squeeze in a dad joke in a discussion of abstract computing problems related to 8081s and I'll go on a limb that HN not lenient on badly executed D-jokes as say reddit would for the attempt.