Blind your eyes to petty criticism
Moses was seen as the patient leader of a people with little faith. His church was a murmuring people. They complained and whined at every inconvenience and displayed little to no thankfulness. This disgusted Moses, and his patience had worn thin. He had had enough.
Petty criticism wears on the leader. The wise leader will work hard at blinding his or her eyes to the pettiness of team members' criticism. If that doesn't work, it might be time to put your foot down and call these people out for their grumbling. But like Moses, have the resilience to see things through. Nobody said leadership would be easy.
"Fear not! Stand your ground... the Lord himself will fight for you; you have only to keep still." - Moses