Well, that’s funny in a classic pub humour way. Except the guy didn’t get it (and neither did many others) who went on to say “Many bad philosophy classes you mean”
Like, dudes, what did you think that was? Except the whole internet is full of this. Even the slightest of puns needs a second character arriving afterwards who repeats the punch line but with some obviousness baked in.
It’s just that people aren’t literate. And I’ve got to be honest, a lot of such casual wordplay is just beyond Americans (who are generally superior to the British in every other way). They kind of need to be looking at a guy with a microphone to pick up on the joke. Probably the Germanic influence.