Economics professor asked “whats the point of bitcoin?”

Today at my university class, the professor asked “whats the point of bitcoin?” The room was somewhat silent, then some responses about it being purely for speculation pop corned around the room. I sat in silence while he proceeded to slander btc and state multiple points of false information, such as “originally the creator pegged bitcoin at 1 us dollar and never meant for it to be priced the way it is, also its backed by nothing, unlike this physical dollar in my pocket. Clearly he doesnt understand bitcoin, but i wonder what would have been the best response to such a question.