"A monad is just a monoid in the category of endofunctors, what's the problem?" is a joke about how the Haskell community often forgets not everyone has a PhD i

"A monad is just a monoid in the category of endofunctors, what's the problem?" is a joke about how the Haskell community often forgets not everyone has a PhD in category theory. It's not a real thing Haskell programmers tell people, in my experience.