Maybe because of this? https://news.ycombinator.com/item?id=36584464
Gamedev used to be a far different culture. Code that would get thrown away after release, short deadlines, gremlin bugs in code written in a convoluted way to eke or another few fps, tons of ill-architected systems interacting with each other in unforseen ways. To quote the kids these days, some of the comments hit me right in those feels.
Some people are just immature.
I find that PRs are the best place for rants. I can let out steam while sharing and recording my journey and lessons learned, while not making the code worse off with silly variable names and sloppy comments.
I have once added a comment saying “this was a very painful function to get right. If you change it you will suffer the same fate. See PR#1234 for details.”
Not usually my style but I wouldn't judge it as "not talking it seriously".