What’s he a doctor of? Is he like Michael Savage, who loves to tout his PhD, even though it’s in Nutrition, or something?
Not defending Savage. At all.
But, why wouldn’t someone with a PhD be able to use it in their lives. That takes a ton of work. And it is a title that deserves respect.
Of course, the ones I know (and there are a couple) use them professionally, but not in their private lives and certainly not when the title could be misconstrued.