For starters, it's incomplete. Yes, "some" people think humor itself is offensive. I would wager that there have always been some people like that, since humor itself was invented. How does that relate to what happened to Stack Overflow?
To make your answer complete, you have to connect the remaining dots, and there are multiple ways to do that. Thing is, none of those ways are "obvious".
For example, you could posit that the majority of people find humor offensive today, as opposed to 2014, but I don't see any evidence that's even true, much less obvious.
More likely, you're implying that the majority of people who have influence over Stack Overflow's tone consider the humor itself offensive. If that's obvious to you, it sure isn't to me.
Are you expecting a link to a scientific study proving it, or what?
.. is what I said. Why can't you just leave it at that?
Most of this thread is humorous, or trying to be. I don't see you answering every other post in it.
I'm not sure what happened to SO, I can imagine their intent was to improve quality and reduce duplication - both bad for e.g. Google ratings or returning users. But the funny posts made it a living community. Removing the fun parts of a site like that makes it sterile.
I mean there's still e.g. codegolf, worldbuilding or the D&D spaces that are kinda funny sometimes.