My first thought on starting to read his tweets was that he was cold-hearted. Really quite appropriate that he's getting a bit of a roasting! 🔥🔥
"My PhD student" --> "a PhD student in the/ my group", or "a PhD student who I supervise/ advise."
Man, that's cold. Even with people pushing back and saying exactly that, he still keeps coming back to argue his gotcha, because People Are Wrong On The Internet. (Not his own communication skills which are at fault, exceot insofar as he's clearly communicating what a massive have-to-be-right wanker he is). 
@BickerinBrattle. Yes, I really think you're right about the way they want reality to serve language, nit the other way around.