Sometimes I wonder if the kids would be unhappy if this generation of parents didn't tell them they're supposed to be unhappy. I think it's the parent's ego getting bruised their kid isn't the star or a starter.
I never remember my father commenting on anything negative regarding teammates and coaches. I remember one year of college summer ball the coach promised twelve position players starting positions. When I complained to my dad he asked what I was going to do about it. He meant on the field, not complaining to the coach.