Way to go on setting your boundaries This is the part where he starts to try to drag you back into the interactions you've had in the past. It's where he takes out all the tricks of the trade, so be prepared to be FIRM, stay on point, be tactful and don't let him drag you into a fruitless argument on this. Remain polite. State what you've stated before and don't go off course. If need be, remove yourself from the sitch before he convinces you that you made the wrong decision and you start defending yourself. This might also be a good time to act as if, cheerful and like nothing unusual happened. You offered, he declined, he's a big boy and needs to accept responsibility for his choice to not ride in the truck. It's your vehicle, you have the right to drive it and not accomodate his means of punishing you.
This is the part where he starts to try to drag you back into the interactions you've had in the past. It's where he takes out all the tricks of the trade, so be prepared to be FIRM, stay on point, be tactful and don't let him drag you into a fruitless argument on this. Remain polite. State what you've stated before and don't go off course. If need be, remove yourself from the sitch before he convinces you that you made the wrong decision and you start defending yourself. This might also be a good time to act as if, cheerful and like nothing unusual happened. You offered, he declined, he's a big boy and needs to accept responsibility for his choice to not ride in the truck. It's your vehicle, you have the right to drive it and not accomodate his means of punishing you.