Ph.D.s are usually scientists and dont have the god complex of most MDs. Thats why they are so much more laid back about being called Dr (even though the PhD is the higher degree). I’m just sayin.
Our next-door neighbor is a retired professor,with a PhD in Kinesiology. Did his post-doctorate work at Harvard. He's the nicest, most humble and down-to-earth guy I've ever met. He had no qualms asking me to come over to show him how to program his DVR.
I think MD is on a par with a PhD. PhD stands for Doctor of Philosphy and MD stands for Doctor of Medicine. I believe they are equal in status.