I would probably wear my stethoscope everywhere, just so people knew I was legit. I’d likely even wear it when I had to go to the doctor, just to let him know I’m a patient AND a peer and that he could shove his diploma up his ass.
However, if in a restaurant and faced with a chocking victim I would merely point at the “save a chocking fucker” sign. Everything everyone needs to know is neatly illustrated by the same people who bring you Airplane Emergency Fucker trifold, laminated pamphlets.
After all, I’m a doctor and I don’t have time for this bullshit!