I have a different opinion.
If you try to see the boss's point of view, then he is yelling at them with a genuine reason which is the loss in business.
If a company is in profit then the employees are also in profit and they have good reason to be happy.
And maybe they are getting this because of kamra. As you know Karma is a real thing
Maybe. But I think What is the point in yelling during the lunch hour- which is the only time when employees can relax a bit in the stressful environment? He can take all the huddles about the business during working hours. Shouting and yelling when they are on their break while having food is not a good thing. If the employees sit silently during the lunch hour instead of laughing how is it going to help the business?
Sorry, I just forgot about lunch thing. Then you are right.
There is absolutely some defect in the boss.