Dude, PhDs give a fuck about PhDs. At least in the States. I would find it odd to be addresses this way. When I addressed my phd supervisor the first time with

Dude, PhDs give a fuck about PhDs. At least in the States. I would find it odd to be addresses this way. When I addressed my phd supervisor the first time with professor doctor XYZ, he just said, I am Bill. My name is Bill!