Of course it's frustrating to encounter inflammatory comments that are based in ignorance. But if you respond like this, you feed those comments and give them greater credibility, while discrediting the very side you're trying to defend.
If you know more, then a better way is to share some of what you know so that others can learn. In any case, if you post here, please stick to the site rules regardless of how wrong or ignorant other commenters are or you feel they are.
My apologies if it came out wrong.
If you post in the flamewar style, everyone's going to just go rigid and fire on all cylinders. This mechanism works the same way regardless of what the topic is, and regardless of whose position is right or wrong.
I think the HN's algorithm also contribute to the problem: the fastest and most upvoted response leads the discussion, and normally not the most valuable.
You should try to enjoy it too. It gets lonely sometimes :)