Why would someone consider a custard pie in the face to be degrading? Surely it's just a harmless joke.?

Because some people are uptight douche bags that need to loosen up and go to the proctologist's office to get that dead creature removed from their rear end! (I say rear end because when I say the “A” word it gets censored. Let's give it a try shall we... *** (You see, the damn word is censored). Which in my opinion is BULL ****!!!!!!!! So to all those douche bags, let's give a big FU on 3, 1...2...3 **** YOU!!!