Recently a teen was sent home from work for wearing a Kaepernick jersey after a customer complained

I often wish they'd send folks home for wearing their pants under theirs butts with their underwear showing. I can't stand it when someone like that waits on me, I want to ask management if there's someone else available who knows how to wear pants properly.

Sorry, I had to vent. I don't know if either instance is legal; the teen's jersey you mentioned or the saggers that I mentioned.
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  Many businesses have rules about wearing clothing that may be offensive to others. A kaepernick jersey would be offensive to some Americans. In fact, you could get beat up for a jersey like that! 

Of course it`s legal, and it should be. You`re on his property and working for him. He signs the checks and it`s his rules and his way. An employer does not owe you a platform. This is not even remotely an infringement of personal rights.

Employment at will.

Hi Rosue, I'm with you. I think seeing their underwear is disgusting as well as their butt cleavage. If they were my employees, I would send them home. Thank you. Like.

Hi bhwilson, I'd go topless if the only choice was to wear HIS jersey. Lol. Thank you. Like.

Some are not only calling it illegal, but they're calling it racist as well. Boy some people want to label every freaking thing racist. Thank you. Like.

Oops, I should have said Randy*

Yes.  They have every right to expect people they pay money to, to follow company rules.  Sorry.  That is life, man.

If I don't observe the dress code for my school I get sent home.   And I am paying THEM.  So, don't complain.  The reasons are PROFESSIONALISM. 

And the MAN tells you what is professional when the man is paying.

Of course.

Hello PC:

During the time you're under the clock, you represent your EMPLOYER, not yourself.  If you don't represent him the way he wants to be represented, he's gonna fire you, and legally so.

excon

The employer inevitably has final say as to what's allowed during company time.  That being said, if the employer has allowed the wearing of jerseys as part of the dress code, and did not specify any exemptions (certain teams, players, other) then it is unfair to punish an employee (loss of hours or job) for breaking an unwritten or previously unspecified rule. 

If this happened to me, I would have apologized to the customer, but I would have ultimately defended my employee.  This customer was b*tching for the sake of b*tching. 

thats crazy and mean to do that