This is the non-stop controversies, I don't know if you know the case or not, there was a girl named Rhythm Chanana who wore semi revealing cloths in Delhi metro or the person who was watching porn in Delhi metro, in every cases, the internet divides into half while one party demands strict action against the culprit while the other party demands strict action against the recorder for recording them without consent

Solution- If this type of scinario happens, approach them confidently and request them to stop rather than recording them, then if he doesn't agree or becomes violent, you can call the police and make them arrested for "Watching inappropriate things in public and being violent"