Anger issues

This morning I fed my daughter and after she was having a tantrum, my dad was offered to take her outside. ( I didn’t want her to go out at that exact moment because if she goes out in a bad mood, it’s gunna be harder to want to come inside ) I told him maybe later, after she calms down. He threw her clothes on the ground, started screaming and yelling and swearing.. mad because I said no. Am I In the wrong?