I hate it too. My daughter was in the NICU for 3 months after she was born and I heard it multiple times I day. I also restated their question of “Are you Mom?” to “Yes, I’m HER mother” or “Yes, hello, I’m XXX” but they never got it. Those who worked with her every day began to call me by my name but every new blood draw person, every OT or PT or doctor or social worker…I really hated it.
Everyone in the world calls my mother Nana. My brother has about 800 players a year in his lax program and they all call my mother Nana, their parents do, their friends. My kids do, of course, and all their boyfriends and friends call her that. That doesn’t bother me, but of course it isn’t me.