Why not just stop playing the national anthem and waving the flag at domestic sporting events..?
It's a flag, for goodness sake, not some holy object. As for the national anthem, if anybody wants to sing it, let 'em. It shouldn't be an enforced ritual. If somebody wants to stand in the crowd singing and looking like an utter d***head, that's fine by me. Nobody else should have to join in just so they look like a "patriot." Sheesh... how dumb is that..?
Now, OK... it's reasonable (more or less, although I could still live without it) to identify with your country if you're representing it in an international tournament, say, a FIFA World Cup tournament.
If you're an athlete who has risen to become one of the greatest in his country at, say, Conkers or Frisbee Throwing or you're going to take on the might of Upper Volta in the Quidditch World Cup final then of course you would want the world to know where you come from. Fair enough.
But this is about Americans, in America, playing American football against other Americans in front of an (almost entirely) American TV audience and a stadium full of American fans. Who are you trying to impress..?
As for the international TV audience (which I would suggest probably isn't as big as you like to flatter yourselves).... I can only speak for myself but I wholeheartedly support anybody who takes a stand against racism, bigotry, hatred and state-legitimised murder, and if they exploit this insane infatuation with symbols and songs in order to gain publicity for that cause....
I applaud them and wish them every success.
To the flag wavers who seem to spend most of their lives with their right hand apparently Gorilla-Glue'd to their left breast and can't stop themselves from mumbling something about rockets red glare with salty tears trickling down their faces, I can only suggest this:
Just go to watch the game.
Gridiron football is a very enjoyable sport. I rather like it. (Go NY Jets..!! Yaayy..!!) It can be played and followed very well, very hard, very passionately and with great excitement and entertainment without a fatuously "patriotic" ceremony beforehand.
But if this has to happen because of some sort of arcane constitutional holy writ, then don't be surprised if a discontented, downtrodden and oppressed section of your society uses the publicity it obviously generates, by exploiting it for their own ends.
Good luck BLM. Keep fighting. Never quit. Never give in.