If you look up what kneeling really means then you should probably stop doing it. When you kneel you show submission. You kneel to pray. You kneel when you ask your wife to marry you. You also kneel before Zod before you throw him into an icy crevasse.
I coach baseball and softball and when a player gets hurt, all the other players take a knee. Why do we do this? It’s to show respect and care for the other players well being. Maybe a better choice for disrespecting the national anthem is to stay in the locker room until it’s over instead of making a spectacle of yourself. Just because you have the “right” to do something, doesn’t mean you should.