I mentioned it on this blog here, but I should have gone into more detail. Luboš was brutal toward Weatherall. He tells a story of teaching a physics course at Harvard with Xi Yin. Weatherall was one of the worst students and got a C purely out of compassion, he says.
Blogging your own student's bad grades seems like an outrageous breach of trust to me, if not actually illegal, and Luboš was criticized for it in the comments, but he was unrepentant.
I recognize that there is a certain irony in the blogmaster of El Naschie Watch saying that another blogger isn't being nice.