I feel the same way, even if its just one comment out of 20. That one comment can really get to you, and it lowers the mood to a generally negative level. I have a lot of respect for people can blog about "new" ideas on a regular basis. It takes a lot of persistence.
Author here. I totally get you guys. I'm just the same and I actually got a few hate comments (not on HN) about this article. Of course, it makes me sad and I'm thinking about just stopping everything. Why bother? But the next day, I realize there are people who liked it and that makes me want to try again and get better :)
The beauty about comments is that if you own the blog, you can moderate them. Having a discussion about why something is wrong is a good thing as long as it does not turn into "I hate your f-ing post" type of deals.