That’s because Jimmy Stewart (unlike the three mediocre people you mentioned) didn’t have to make themselves known through outrageous and assinine comments. He was the star. Everyone knew it. He behaved like a dignified gentleman while being a star. Those days of well mannered behaviors and dignity in hollywood are long gone.
Got to “meet” him (shake his hand at a theatre) in Ft. Worth. He joked about the hair dye on his hands. A college friend lived down the street from where his Air Froce friend lives and where Stewart came to visit. Was at a party at the house. and said that he was very unpretentious although edgier than she appeared on screen. He was, after all, then a 50 year old man who had been around the barn a few times.