They use it as an insult by saying we no longer do.
Private practice doctors can accept whatever payment they like.
I have known two orthopedic surgeons that are cash only, no insurance accepted. And they both take whatever you are willing to pay.
As I said, one of my med student's mother is a doctor in Appalachia and has accepted pies, chickens, and more.
I myself have accepted a car, an AK47, a steak dinner, and more. But that was not for clinical consultation, that was for medical education.
My most recent licensed clinical work was during COVID. That paid a salary, which I donated back to the institution.