Reddit's in-jokes and overall sense of "humor" are lame and I don't want to see them migrate to Kbin.
I like the overall lack of in-jokes I've encountered here so far, and I want things to stay that way. This might be an unrealistic thing to hope for, but I like good, pure, discussion, as boring as that may be for some people.
It seems like you're in the wrong Fediverse instance. I think beehaw makes an attempt to keep it serious and on point, with more moderation.
Also try tildes, which has a very interesting voting system where you can attach a tag to your upvotes or downvotes, such as 'noise' or 'off topic' or 'joke', and overall vote score gets reduced - not sure exactly how it works. (Tildes is not part of the Fediverse though, if I recall, it's stand alone site like reddit.)
Both those may be invite only.
On reddit there is a subreddit of r/WorldNews called r/WorldNews_Serious which moderates out the jokes and trivial discussion, so look out for those communities to popup in the Fediverse.
I don't mind jokes, even the bad ones - it shows these people are at least cheerful and upbeat even with the world not doing so great atm. If you think the joke is lame, that's what the downvote is for, so use it would be my advice.
Honestly, I think other reddit alternatives could benefit from adding something like the labels from Tildes (exemplary, off-topic, joke, noise, malice) in order to create sorting algorithms for different types of users/communities.
It could, for example, allow people who are tired of the constant jokes to have comments which get labeled as jokes sorted lower, which could even be the default in communities intended for serious discussion... or you could do the opposite and sort funny comments to the top when jokes are the purpose.