It was also a joke and you missed it for whatever reasons. Anyway.
Calling them 'show offs' can only come from poor people. They are paying for comfort, not to show off. And if you are wondering about selfies made in business class - how many selfies are done in eco and put on fb/ig. Many more.
Personally I can't afford business class all the time but EU <-> Asia it has to be business class for me, I am a tall/big guy and also got panic attacks in my early adulthood in situations where people get very close together and won't stand 10h+ in the seat made for petite girls.
So, me traveling business class means the airplane is not at risk at getting hijacked by me because of a panic attack. Win, win.