I also think it depends on what they are doing. If someone is just staring, or making rude jokes with their friends, I wouldn't make a fuss about it. It could be a misunderstanding, and I wouldn't want to get someone into trouble unfairly. Maybe it's just a freediver getting some training done.
If someone is actually following me or someone else, and I am sure of it, I would ask them to stop or tell a member of staff. The same goes for making unacceptable comments. And of course, if someone is behaving suspiciously to children or other vulnerable people, I would report it immediately.
Lucia
