I can't think of a good reason not to accept the pull request. It all seems like such a simple problem getting blown way out of proportion.
The patch itself comes across almost as bullying: accept our view, or be publicly shamed as a misogynist.
It is of course good that they want to contribute but some requests generate more traffic around the request than the request itself. Not if this was a bigger improvement to docs, a project wide spelling fix, I would probably be better.
Anyway the reason this go blown up is because of the gender aspect. Ask yourself this, what if this was not influence by the gender and was instead a basic spelling mistake, how would this played out?
To be honest, you'd find a huge discrepancy on this. If this were true, the pull request would not have been rejected.