I never had any problems at school. I did not go into "Assembly" each morning until the end when the announcements were read out. I was the only JW but the Catholics did likewise and nobody bothered. We all sat in the library which was adjacent to the Main Hall.
Likewise at the end of a film at the cinema, as soon as "The End" came on screen there was a rush for the exits, where I lived I don't think there were many Royalists.
The only time I was really embarrassed was at my degree ceremony. We were all standing and as the National Anthem started I had to sit down. Later, probably in the 1980's there was a QFR and it said if you were already standing there was no need to sit.
George