It's always perspective to hear a small child have a complete meltdown. When you're 4, you're still feeling out things like having emotions, and you do NOT know that this isn't the only time you can get to play in this playroom, or that there might be other brownies to eat, etc, and it would be really easy for the adult around to really lose it and slam down. Everyone born human is potentially on a collision course with completely terrible emotional baggage.