Wow, how badly you must've been raised to think mom-jokes are good.
That is true / half-true / a joke.
Yes, if you think mom-jokes should be used and are funny when used, you are indeed, an idiot.
Fight logically - that "joke" I just made was both true and funny (for the right people), and no one can really make a proper comeback to such a comment with using logic, unless ofcourse they were joking X)