You know what the real thing is, about standing for the anthem? That shit is CHEAP AS FUCK.
Standing for the anthem never costs any billionaires a single cent. So, of course, that shit becomes a primary, defining characteristic of being a "loyal" or "true" American. Pretty much the ONLY characteristic, really. Everything else costs something, and the anthem-obsessed assholes never seem to want anything to be paid for.
Ask these motherfuckers about social programs, fixing the homelessness situation, fixing the (related) housing price situation, feeding hungry children, providing healthcare to the population, etc, and you'll get responses like "well, see, I'm a Libertarian. It's obvious that you're more of a Statist. I can provide you with some PragerU videos that will teach you how all state-run interventions are always doomed to fail."
But then you decide not to stand for the anthem, and the same motherfucker will be all like: "OH MAH GAWD, WHY DO YOU HATE YOUR COUNTRY?? THIS GUY HATES HIS NATION!"
If you basically object to the state ever doing anything for anyone, then nobody should be standing up for it.
What they are saying here is, all of us are victims of America's racist past, whether or not your family was around when slavery was an issue. It's just sort of a snarky way of saying that.
I have to assume it's about Nikki Haley and her dumbass remarks on the Civil War.
Like, if you're going to pretend you don't have to think about or acknowledge the bad parts of American history because your family wasn't here yet don't try to get Patriot Points (TM) for talking about the good/prideful ones.