draw a box on the floor and tell him not to step out of it and then leave and next time you see them tell them they been marginalized.
when I argue with someone I start going into details and using big words that don't even make sense and then start making the point they were making so that I cover all of my bases.
I know what I'm talking about, I have been the victor many times!
all you win is a pair of roller skates and a goku backpack cus you fuckin 12 bro