So we probably should not take 171 so seriously either, after all it is just a code.

"§171. Conduct during playing
During rendition of the national anthem when the flag is displayed, all present except those in uniform should stand at attention facing the flag with the right hand over the heart. Men not in uniform should remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart."

I guess we all interpret or observe the code differently.