Whether they were late or not is irrelevant, the timing was, for whatever reason, wrong. If the 3 second exercise was to be done at all it should have been done at half time when no one would have been inconvenienced if it had been a minute or so either way from a given time.
Bit arrogant that o knowledgeable one "anyone who disagrees with what I think is a winker and should take their prattle elsewhere". Still, I would defend your right to express your views however idiotic they may sound.