Fun story - I have an actual PhD, because I'm, you know, an actual scientist. I make everyone call me by my first name, unless they want to give us funding (amazingly VC love to call me Dr. Fllmia, I think they feel better about their investment). Because people with real cred don't need randoms to call them "Doctor" to feel confident.  We know we are good and the quality of our work speaks for itself.