He does! I mock him. He laughs, but deep down I think he hates me for it. 

siggy47

In my experience, insistence on the title varies inversely with the rigor of the discipline.

I think mathematicians and physicists are often so bizarrely intelligent that we want to label them.

Undisciplined

I have to admit there are degrees along the spectrum where I can see it being justified. Any of the hard sciences, engineering. Maybe even economics. Psychology? No

The Zen of Referring

cryotosensei

Does he go by "Dr."? Most economists have the good sense to just go by their names, like normal people do.