He was apparently upset because the initial scripts (Lonely Hearts, In The Dark, I Fall To Pieces, RWAW) were all given to the Bts writers, he felt like they were being favoured over the new writing staff on Ats, but yeah it does sound like he was being a bit impatient. Possibly he was feeling oversensitive because he had been left so frustrated with how things were delegated on TXF, and not getting more of a chance then to show what he could do?