Listen Buddy. You are going to quit screwing this up, or one of a couple things are going to happen....
When you call foul ball the ball is dead. No runner's can advance on a caught foul ball because you have called foul and play must now stop.
A foul tip is not a foul ball. The defense (catcher) has the ball in his hand and can make a play on a runner that is attempting to steal. If you call foul ball, the play is dead; runner must go back and the defense is denied opportunity to make a play and get an out.
Your emphatic calls of FOUL BALL are wrong. Either you are going to stop or you are going to leave the game; and, I will finish by myself. If that is not agreeable, then I will leave the game and you can finish by yourself. Because I will not allow you to continue to screw-up my game. You are my partner. Either quit trying to subversively fight with me, and be my partner or you're going to end up finishing this game by yourself.
Nuff said?
This seems harsh and probably not cool but, in 20 some odd years, I have been in a couple situations where my partner has tried to fight with me or intentially make improper calls to favor one team... I won't tolerate that crap ever again.
It would be tough not to say the above and to stick with the game. I won't know what I would do until it happens... again.