> But then I told it "It's actually the word "bar" that's being used in the wordplay. The word "duck" there just means evading something" and asked it to explain the joke again

It gave a couple wrong answers and then was told bar is the wordplay. It didn't figure out bar has two meanings on it's own. It was also told duck is meant to mean evade and to try again. I don't agree that it came up with these associations by itself when was fed the knowledge bar has multiple meanings in the joke and duck in this context means evade.