I think its because Zuck created FB and while we dont doubt he is evil, he is evil in his lane. Privacy invading social cancer has always been his product, Meta is the 2000s version of "big tobacco"
The "meme" of Zuck is a socially awkward robot, the meme of Elon is an attention starved diva who will do anything to try and stay relevant.
Some people dislike Zuck, some people FUCKING HATE Elon.
The problem with racist humor is that theres a limited number of premises. How many ways can you make a slavery or no father joke about black people? How many math jokes can you make about asians? Muslim terrorists? You get the idea.
I dont want the same lazy bullshit over and over. I want my dark humor to be fresh! I want my Titan submarine jokes before the bubbles reach the surface.
Racist humor isnt "dark" humor, its lazy tired rehashed crap. Real dark humor is like kids with leukaemia, it never seems to get old.