A few days ago, while staying in a hotel, I saw someone create a scene during breakfast over something that was done not right. Over the next few days, I observed the hotel staff providing them with a special treatment, likely to placate them.
Coincidentally, something similar had happened to me as well, but I didn't complain. In fact, I didn't even tell anyone about it. I started thinking if I should have done the same to get that special treatment, perhaps some extra perks or an upgrade.
Then the thought came in that it would have been a bad tradeoff, even from a purely selfish point of view. Habits (or sanskar) don't distinguish place. If you allow yourself to be upset, offended or miserable in one environment, you are training yourself to in other areas of your life as well -- with your loved ones and with yourself as well.
In a world that tends to reward people for not being happy -- the hospitality industry focusing on the most difficult clients, eompoyers raising salaries for employees who are interviewing elsewhere, and companies offering promos to unhappy customers -- it is revolutionary to be happy.
As a corollary, to be a great leader, you should focus on the happy users/employees/customers just as much, if not more.