Learned a bit following this mess.

1. Trump violated his Presidential Oath by stating players should be punished for exercising their 1st amendment rights.  Nobody considers holding him responsible for that.
2. People confuse nationalism with patriotism.
3. The flag-waving crowd often talk of keeping government out of private business, but in this case, it's ok.
4. NFL players on the field during the anthem began in 2009 and was an advertising scheme by the military with the NFL making money from it.
5. All teams who roll out that big horizontal flag are disrespecting the flag per U.S. Code section 176 Respect for the Flag, item (c).  But, the flag-wavers don't care.
6. The flag decal on the NFL helmet is violation of that same code, same section, item (j).  Again, the flag wavers don't care.
7. And second in importance to item #1 above is that nationalism is a great sales and profit tool that can be used to turn the country against the Constitution.