bus fare humiliation rituals

Just witnessed a bus driver get up and walk to the back of the bus to berate a young woman for not paying enough fare. This is the third time I’ve witnessed this happen where the driver makes a scene when someone doesn’t have enough money. I understand that they have a job to do, but there’s something very eerie about people getting yelled at over $.75 cents. I also understand that the rider should communicate if they’re short their fare, but I still don’t think it warrants that sort of reaction. Maybe I’m wrong!