Earlier quoted context omitted.
Nobody who removed the joke said they were offended by it, they just said that they didn't believe it was the sort of thing that belonged in technical documentation. If anyone is offended, it is RMS, in the sense that he seems personally affronted that he doesn't carry the line-item veto power he thinks he had over all of GNU and people did not ask him before removing something he added 25 years ago. Not everyone who…
Technical documentation isn't the place for a joke full stop. Documentation is for people who are typically busy, uncertain and potentially dealing with something that is going wrong. They want clear, concise and accessible help. They don't want or need tasteless jokes. It is disrespectful to their time to include random garbage. This is supposed to be read by people who need it, not people who know what is going on…
This is a bad take. When wading through dry technical documentation a little humor can make it much less laborious.
As long as the humor doesn't result in ambiguity, there's no problem.
Something like "You can tune a filesystem, but you can't tune a fish." at the end of a manpage may elicit a chuckle but doesn't reduce understanding.