Is that because there is some more depth to the joke, that Mozart did this for real "when mozart was out touring europe getting drunk and shitting on women" - "shit on women"? So Bach metaphorically shits on Mozart for being the greater composer who was in it for the music and now gets more fame?
Because I was rather appalled by that language, but maybe lack background context.
Mozart loved wild parties and had a feces obsession. He also was born 6 years after Bach died so no, Bach didn't shit on Mozart, only the Academics do. The only shits Bach cared for was getting paid and making good music. Mozart on the other hand was "paraded across europe" but as a child. By the time he was an adult, he had a job. By the time America decided it had had enough of the British, Mozart left for Vienna.
Hm. Not convinced that this qualifies for a poop obsession. Rather sounds like using language for a shock effect(on 2 occasions), but thanks for the link.
