I'm not. PZ Myers was on the Atheism+ side of the schism in online Atheism in 2011 (from which my pseudonym derives), and Scott was firmly on the other side. They've been on opposite sides of the culture war since either of them became aware of it.
But even if you didn't know that ancient history, Myers is orthodox progressive, Scott is heterodox. They're natural enemies.
Took everyone involved by surprise, but it made sense in hindsight. Half the people were there because religion was oppressive, and half were there because religion was factually wrong.
These two groups were never the same, and they got along only until it became obvious that the first group didn't care about facts and (according to the first group) that the second group didn't care about justice (I would say they do, but not if it means lying about facts).
But even if you didn't know that ancient history, Myers is orthodox progressive, Scott is heterodox. They're natural enemies.