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To some extent, yes. A good coach knows when to be an "asshole". It's how the player responds and moves forward that defines their maturity.
Placing the blame for their own shortcomings back on the Coach is very millennial.
Try recalling various All-stars in the past who demanded special treatment, and threw a tantrum when they didn't get it. In their own minds, those players were bigger than their teammates, coach, and even the game itself! That's how we're raising millennials. Poor parenting. Lack of respect. Entitled.
..And I'm in the middle!
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No.