I don't know Rapinoe's protest (but can guess) and may not agree with it being classy, but it's very difficult to express anything earnestly in america and do it unpatriotically. Because freedom of expression or civil disobedience, almost to any unpopular extent, is the literal guts of Our patriotism. We're a nation moreso built on that principle than we are built on the principles of waving flags and loving troops. On that balance, for example, joining an anthem or sitting it out are the same. Both sides regard the first amendment, I guess, but only the first one (allowance to be however unpopular) inspired it.
We were the first nation to promise minority opinions had a home forever. And even when we hate those minority opinions, we should love how our country has this legacy.