If I'm carrying concealed I ignore them. If they realize I am armed and ask me to leave I will do so immediately and with no argument. It is private property, after all. However, I am also of a mind that those who would disarm me take responsibility for anything that happens while I am disarmed. If they don't wish to do that then perhaps they should allow me to remain armed. I am no threat to anyone who is not a threat to me.