I find this confusion over the difference between patriotism and nationalism very disturbing. These flamboyant displays at sporting events are NOT patriotism. They are for the indoctrination of nationalism.
"Patriotism" is not demanded it is an act of admiration to the collaborative success of good by ones countrymen. It is the show of pride in the brothers and sisters you share the nation with. It is not your duty to show patriotism as it is a gift from each of us the individuals and our choice when to display it.
"Nationalism" is a tool, a disease that collectivist like communists, socialists, and fascist, employ to manipulate public opinion to control the masses and dissenters.
If you're up in arms over these idiot athletes attempting to protest social issues then you yourself are just as foolish as they are.
I have been in the military for 19 years and counting. I serve alongside great brothers in arms who are Purple Heart recipients. We all bleed red white and blue and some of my friends will even stand up at attention for the national anthem if we were out in public or at a restaurant. Great for them. That's what they want to do and they are able to do it and it's awesome. We don't demand that every able-bodied person HAS to stand though. That's not America.
Instead I see the following image all over my social media.