My customer proceeds to tell higher-ups in my company how he was treated by an employee of this company. Guess what probably happens to me? I probably get axed. Are NBA players any different? I think not.
People pay millions of dollars a year to watch NBA players do their jobs. I'm sure you're good at your job, but I doubt anyone pays money to watch you do it.
That doesn't give them license to attack people, but it does mean that their employers are going to give them more leeway than you or I would get from our employers.