That's one hell of a jump to go from "not keen on anthem protests" to "racist".
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Well, yeah, that's what social norms are. I don't think there being different social norms in the USA than Europe means anywhere near as much as you're reading into it here.
Sports should be a sacred thing, not a platform for your current political beliefs. If you want to make address racial inequalities good for you, make a speech after the NFL game if you want, but don't disrespect the flag or the others that fought for their country because you feel like taking a stand.
Both of these responses strike me as virulently wrong. If you're incapable of viewing anyone that thinks people should stand for the anthem as anything other than "racist or stupid", you're failing miserably at basic empathy in exactly the same fashion as the people you're targeting. I'm sure you won't be, but you should both be ashamed.
I find it very difficult to feel empathy for people who revere a symbol ahead of the freedoms it represents.
The only thing I can conclude about these people is that they don't like being reminded of this topic and want it to go away so they can watch sports and not have to be involved in or have any responsibility for their society.
Both of these are far afield from the initial claim I addressed, which was:
Aside from any commentary on the object-level merits of the protest, the notion that anyone that think these protests aren't a good thing is racist is just absurd rhetoric.