As I have said on FR before, the only time I remember him getting truly angry with a caller was in ‘94(?) when caller Karen from Whitefish Montana said that very thing to him and he basically told her to drop dead. In recalling that conversation, she was correct in every particular, and he was incorrect. What really got to him IIRC was when she called the GOP establishment “Happy conservatives.” His anger was palpable.
I didn’t remember her name (I thought it was Carol) but I absolutely remember the call. I was on the road at the time and remember yelling at my radio as he was telling her how she was wrong.