The biggest trick is to break people out of their capitalist programming. Instead of rebuttals, just ask questions.
“We need landlords”
Why?
“Because they provide housing, duh”
Ok, but what about housing do they provide? They don’t build the buildings, they just own it.
“Sure, but they do the repairs”
They do, but why do tenants have to pay someone else to live there in case a repair is needed? What if the tenants owned the building together instead?