Sometimes losing is hard.
Some people can be sore losers.
This grown man could not handle losing a robotics competition to a bunch of children and immediately walked off when the "unanimous" results were announced and he found himself on the losing end of things.
One Reddit user shared some insight and noted that the adult was disappointed at his own team for changing a weapon on his team's robot in a critical match. The change did not function and they lost to the meddling kids.