Please don't. The Twitter snark isn't normal, it's an exceptional case. It wouldn't be on the front page of HN if that kind of behavior were the norm. And it's the jerks on Twitter who came out looking bad here, not the author of the code.
I really like how GitHub has encouraged people to err on the side of releasing their personal experiments. I was doing it myself in pre-GitHub days by publishing Darcs repo URLs on my website, but it didn't have the social aspect and Darcs never caught on like Git has. It's lovely to see the idea of "share all your code, by default" so validated as it is on GitHub.
Whether or not you release your code, assholes will still exist and they'll still find a way to be assholes. So don't let them ruin a good thing.