do employees have them when in the work place?  When I get a burger at McD's and have the 'Black Power salute" thrown at me when I pay...the employee has no legally protected-right to do that.....and I won't return to that McD's either....the players are at their workplace...just like the McD employee...., I go to football game to see a sporting event, not a political rally. I go to McD's for a burger, not to view a political statement.

What if a "white nationalist" athlete, or several of them were to launch a similar expression of THEIR 1st Amendment rights, would you support their right to be heard?

(Haven't read the whole thread, but there seems to be a mashup of different things.)
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FORCED: I thought that an employer or school or whatever cannot force me to do something that violates my Constitutional rights. E.g., children cannot be forced to say a prayer in the public school classroom. (SCOTUS, 1962: http://en.wikipedia.org/wiki/Engel_v._Vitale ).  I do not think that an employer can FORCE me to salute the flag and so on, during the playing of the National Anthem.  
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ALLOWED: Before SCOTUS 1962, kids were allowed to do something else non-disruptive if they didn't want to participate in the daily prayer.  Because that was stigmatizing, school prayer was ultimately eliminated. I should be allowed to something non-disruptive if I do not want to participate in the National Anthem ceremonies. Go back to the locker room? Stand up with my hands at my sides or clasped behind my back and w/o the salute or hand-over-heart? Kneel? Is kneeling too disruptive? Well, for some Presidents it is!
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NOT ALLOWED: While at work, I am not allowed to use that pulpit to promote my own agenda, especially if it will reflect, badly or not, on the employer or business. I cannot burn a flag on the 50-yard line during the Nat'l Anthem. I can burn a flag on my own time in my own backyard or at a public rally. The McD employee should not be allowed to make political or social statements that might harm McD's business while at work. The McD employee can participate in any political cause he wishes to after punching out.  
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Distinguish between what is unconstitutionally FORCED, ALLOWED, or NOT ALLOWED.
I know that Rasha would rip into this or say it better if she was reading it.