Do people creep with their phone cameras?

So a friend told me yesterday he caught a kid blatantly filming a woman at the gym. He told the manager, the manager said it happens all the time and tells employees to watch out for it. Seemingly with the idea it's so often that it's not alarming and seen somewhat often. Asked for a description, but she (the manager) didn't seem alarmed by it.

What the fuck is that about? Is this something Gen Z sees others do in all kinds of weird and creepy ways, in terms of filming and taking pictures of others?