It's really odd to make fundamental rule changes to respond to things like that rather than carving out exceptions for sexist remarks specifically if those are the problem.
'This section shall not be interpreted to defend any communication reasonably seen as sexist, racist, or otherwise discriminatory' is much clearer than changing from 'assume good faith' to 'assume nothing, intent doesn't matter as much as impact. '
They quoted the start of a thread the author summarized saying it's bad because it gives cover to bad behavior. And can require people who recognize a pattern of bad behavior to persuade themselves they're paranoid. You might disagree. But those points have nothing to do with race or sex. And pointing out it's easier for people who face less bad behavior is about white men only incidentally.
'This section shall not be interpreted to defend any communication reasonably seen as sexist, racist, or otherwise discriminatory' is much clearer than changing from 'assume good faith' to 'assume nothing, intent doesn't matter as much as impact. '