I remember a thread a long time ago about a foreigner getting in some trouble for this. Shows it is not a double standard.
Of course, you're more likely to find energetic cops and security guards in air conditioned theaters. And if they have to get off their asses, then d*mn sure you do as well. If you are going to break a law, make sure you do it at the hottest time of the day in a place where there's no shade nearby.
Even when a guest in a country other than your own, you stand respectfully silent and still (hat off) for that country’s national anthem. It’s called “manners.”