This, a million times this. Criticizing other people's code is a good idea if you have been asked for input, or if the developer is encouraging the public at large to use their code. Otherwise, it's just unwarranted negativity which has the net effect of discouraging other members of the community from sharing code which might be useful to someone. I have plenty of code that I'm not proud of but would push to Github anyway for the sake of an extra backup/convenience.
No and yes. No, she did not ask anyone to post snarky comments on Twitter about her code. Yes, after said snarky comments were posted, she asked those posting the comments for constructive feedback. (I don't believe any of them actually gave her any constructive feedback, though.)
