You are missing the entire point. It is one thing to not allow gender pronouns (what you are suggesting) versus punishing someone who specifically set out to change gender-neutral pronouns into male dominated ones (the Joyent case). REAL BIG difference.
> It's not that he rejected the pull request...it's that when he was overruled by Isaac some hours later, he unilaterally reverted Isaac's commit. (And, it must be said, sent a very nasty private note to make clear that this was no accident.)
Rolling back the commit or disagreeing is and was not the issue. It was his attitude and behavior after reverting the commit.
Either way, it's still just an issue of someone being stubborn about a PR that neither helped nor hindered the actual code.
If that's a fireable offense in your company, your HR processes are broken. Especially with no management in place to set any expectations on the topic.