Yes, Stuart, Jerry Lewis had a penchant for going way over the top at times. Interestingly, years ago, a Japanese-American friend of mine LOVED Jerry Lewis! Like you, Mr. Lewis never really resonated with me, but he did do a great deal for charity. He was best, in my opinion, when he was teamed with Dean Martin.
I dont think he meant for it to be taken badly as in insulting. He parodied everyone and everything doing them over the top. Businessmen, women, musicians and so on. He did stand up for african americans in the 1960’s but he could be rude and a jerk. I think Keye was rather funny and could do slapstick like the crossing the legs gag with Jerry
Yes, I know that Jerry Lewis probably didn't have a prejuduced bone in his body. He would get very silly and, when he did a racial, or more accurately, an ethnic "paraody," he would do it in a very exagerated way. But, he also parodied some "white" characteristics, too! This is what his style of comedy was: often over the top and exagerated. Keye Luke's way was to roll with it, almost in the role of the "straight man," perhaps. Again, Jerry Lewis' brand of comedy never really worked for me beyond his Martin and Lewis days. However, I know I may be in something of the minority in that respect...