[dang]

Of course jokes are not against the HN guidelines.

[deciplex]

They aren't, but I've seen you call out users in the past basically for making a joke that you either didn't catch or that you didn't think was funny enough to justify the impropriety that went along with it. I wouldn't say it's a big problem or anything, but it does happen.

[dang]

I'm not following the "but" in your first sentence.

As for jokes on HN, there isn't much to add to what scott_s said a long time ago: https://news.ycombinator.com/item?id=7609289.