Ask a Dub acquaintance this and see if they have anything resembling a rational answer:
You: When you're at a public event and the announcer says, "Please rise for the playing/singing of the national anthem," you refuse to stand because that would be considered an act of nationalistic worship, correct?
Dub: Correct.
You: Why then, when a JW is in a courtroom and the baliff says, "All rise for the honorable judge Whatsherface, court is now in session," do JWs stand up? How is standing up NOT an act of worship towards the judge when simply standing up for a song IS?
Dub: Er, um, I'll have to check with my elders....