Boys Arguing About What??

I heard my 4-year-old Braden and my 2-year old Mac arguing this morning. Arguing about what? Arguing about nonsense. Literally "Nonsense". Braden was shouting "Nonsense!!" and Mac was so mad and was shouting "Yes Sense!!" Braden: "Nonsense!" Mac: "Yes Sense!!!!" "Nonsense!!" "Yessss Sense!!!!!!" again and again.