No, they don't. The 1st Amendment does not cover you while you are at work. You can be fired for exactly what these people are doing.
No, Trump saying the owners firing them would be awsome to see isn't anything related to the 1st Amendment. He has 1st Amendment rights as well.
Those stupid ******* players shouldn't ******* insult the people paying their salaries...and I mean the customers, not the owners..
You don't have 1st Amendment Rights here on U.S.......
The first amendment absolutely does cover you while you are at work. However, it does not protect you from being punished or fired by your employer for poor conduct. You don't lose first amendment protections because you are on the job, you just have to realize that the first amendment doesn't mean employers are forced to allow employees to say whatever they want on company time, or while representing the company.
Trump does have first amendment rights as well. I wish he would be more circumspect in how he uses them, but he absolutely has first amendment rights.
Perhaps the players shouldn't insult the customers, but after years of customers not seeming to care when the players use drugs, cheat, beat their wives, beat their children, kill dogs, and kill other people, they might not have expecting simply kneeling during the national anthem to upset the customers much.
Who doesn't have first amendment rights "on U.S."?