According to self-verification, people prefer feedback that is consistent with their self-concept even when that feedback is unflattering. They will not accept feedback that is at odds with their self-concept.
In our hypothesis, men who chose to use urinals for urination are meant to be more confident and have a stronger self-esteem than those who chose to use toilet bowls. They have a stronger self-concept and hence stronger self-verification. They would consider that they did a good job and deserved a more positive feedback. Therefore, a more positive feedback would increase their motivation and performance. If less positive feedback is given to this group of people, they would not receive this feedback as the less positive feedback did not match with their self-concept.
For those chose to use toilet bowl, which showed that they had less confidence and lower self-concept, a less positive feedback would cause a higher motivation and performance since they think they deserved less positive feedback. They would accept it and hence it satisfied