Who controls glibc?

No bullying occurred at all. A suggestion was made, discussed, and eventually acted on despite some opposition. This is the normal process.

No censorship occurred at all. RMS or anyone else are free to continue making whatever jokes they want, or can publish a fork of the manual with the joke intact.

The "safe spaces" you complain about only require a moderate level of consideration for others.

I absolutely concede that sometimes people abuse that mechanism, petitioning to impose unreasonable burdens on others. In such cases, your objections would have some merit. But that has not remotely happened in this case, and unless it does, being respectful of other people's wishes is a very low bar indeed.

The joke's a bit crass. Some people don't like it. Most people don't care. Delete it and move on. No harm results. Objections to this are just crying wolf. Save it for an instance that genuinely needs attention.