The downvotes are telling you that they're not funny.
People love to imagine that their uncivil and unsubstantive comments have value, and therefore that we must be against them for ideological reasons (e.g. political correctness). But that is self-flattery. It's really just that such comments lower the signal-noise ratio.
Flip all the ideological bits and none of this changes. For example, replace "right-wing" with "left-wing" upthread and that comment would be just as uncivil; replace "the PC crowd" in your own comments with whatever the opposite construct is and they would be just as unsubstantive.
I get the HN crowd thinks very highly of itself, but that doesn't change the irony of these comments!
There is no "HN crowd"; that's just a rhetorical construct people use to implicitly place themselves above others. Since you're commenting here, you're a part of HN as much as anyone else is.
But HN does have guidelines against name-calling. None against any particular ideas, though. HN "censors" harsh attitudes and personal attacks, not ideas that are "unacceptable". So it's not particularly like political correctness.
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.