Obviously not over blessed with humility.
My initial thoughts exactly, but then I figured he was probably taken out of context, otherwise he would have become possessed himself instead as the devil will jump into the priest if he has sins and will try everything to weaken him anyway.
Also, for those who may wonder - the priest does not dispel the demon, only God does that. As in the St. Michael prayer....”cast out, by the power of God, .....” We cannot cast out, only get ourselves possessed. Hence, again, they took him out of context.