I've replied to them now with the same appeal. But someone else's breach of the guidelines doesn't excuse your own. Rather than escalating when you see a bad comment, you'd be better to flag the comment, or email us (hn@ycombinator.com) so we can see it and take action sooner.
> I read that left-wing people are consistently found to be much more able to process conflicting ideas than right-wing people are.
Nothing in your guidelines tells me how this comment is ok, but somehow my reply is not.