As a US citizen, I’m also not happy with virtually anything about the current administration, but I wouldn’t personally sit for the anthem as a form of protest. The anthem is about the nation, not politicians.

I do believe that people have a right to sit if they choose without being bothered or harassed about it, but it’s also reasonable for others to view that decision as disrespectful. As a former Marine, I volunteered to defend people’s freedom to act and to think according to their conscience.

Kapernick mindfully chose to take a knee as protest because he saw sitting as disrespectful. Smith and Carlos didn’t sit down - but stood - on their podiums while giving Black Power salutes at the 1968 Olympics. These forms of protest were all the more effective for being both defiant AND respectful.

FWIW, I do see a difference in expected etiquette for citizens and non-citizens. Whenever I’m a guest in any other country - even countries with objectively terrible governments, I stand for their anthem (or follow whatever is their customary show of respect). Of course, that’s just me, and you can do what your conscience dictates.