Does a deaf mute with rheumatoid fingers have a speed impediment per se? How do you (and indeed should you) kiss a *******'s unwashed crutch? When a blind man gets concussed, do you think he sees the stars? Does an invalid with a hole in his trouser pocket feel rather good sometimes? Whom is there left for a Scottish Jew to call a greasy miser? Do cetaceous mammals have a whale of a time or do stud horses have a hard life? Why ask me? I'm a ******* polymath already?
Some of my best friends are Scottish jews so just accept there is nothing anti-semitic in lines 9/10. The joke (such as it is) wouldn't have worked if I had said "a Welsh muslim" or a Congolese atheist" or "a New York taxi driver" instead. I could go on.