I agree, the post shouldn't have called him out directly by name. It should've been a post of just a screenshot with the commit messages, and not mention the repository or the person. It's definitely not nice, and may even affect the person - I mean, if I was called out like that somewhere and seen people laughing at my practices, I wouldn't be exactly happy.

On the other hand, I think that raising the issue in itself - FOSS repositories without commit messages - is a pretty good discussion that fits here well. It's just a shame that it had to be at the expense of some FOSS developer, because it also derails the discussion into talking more about the guy and whether he can or cannot do it (such as your comments, which I agree with), instead of focusing on what are the issues with FOSS projects without commit messages in general. Because there are many arguments why it's important, and a few arguments about why it shouldn't matter, which makes for an interresting discussion about best practices and why they are important.