Answer:
self-serving bias
Explanation:
The scenario being described is an example of a self-serving bias. This is mainly when someone blames other people or factors for the bad things that have happened to them. In this scenario, the girls are blaming the umpire as the reason that they lost the match, but in reality the girls most likely lost the match because they did not play as good as the oppossing team. For the team it is much easier to blame the umpire instead of accepting that the reason for losing was due to their own lack of practice.
He could be demonstrating nationalism
