So they have religious objection to saluting the flag or singing the anthem. I do wonder what they do during the anthem. The wiki page doesn’t say they kneel. Religious objection is more understandable than a decision to protest the anthem.
I suspect they probably don’t attend sporting events, or anything where the anthem would be performed. A JW neighbor in the early '70’s took advantage of a family tragedy, and tried converting me and my Mom while we were still grieving. I was being discouraged to even recite the pledge in elementary school. I think I just mouthed the words for a while.
Being told I shouldn’t watch Scooby Doo because the show had ghosts on it was pretty stupid. There weren’t even any real ghosts in classic Scooby.