I'm an ER doc. Try being the female doctor in an ER full of male nurses. People always used to look past me to find the doctor, even if I was wearing a nametag that had M.D. on it and after I introduced myself as Doctor ____. I still get called "Nurse" occasionally but not so much in recent years. I think part of that is that there are more female docs and part is that I'm gray enough that I look like "the doctor".

I do admire your ability to hold your tongue though. The last few times I've been asked, "Are you the doctor?" I've replied, "Yep, have been all day."