When you come across a person who claims to be a Communist or a Marxist, ask them whether they advocate for the government seizure of BOTH all of the means of production AND of ALL private property, two ESSENTIAL policies without which you have no communism? When they look at you dumbfounded, mouths open, point out to them that they aren't actual communists, just fools who were never taught what communism ACTUALLY means. Feel free to then point and laugh at them.