Creepy guy on the Green Line taking photos of women

Just encountered a creepy guy on the Green Line who was sneakily taking photos of me and other women on the T. I saw his phone screen when he turned around to take photos of other women and called him out on it. He claims it’s “not creepy it’s just art” and refused to delete any photos.

ETA: he turned bright red when I confronted him so he obviously knew he was doing something wrong. I was scared he would become aggressive so I got off the next stop. No one else said anything. Thanks Boston lol.

ETA 2: yes I know it’s legal for people to take photos of others in public but it’s still creepy and an invasion of personal privacy. It’s one thing to be caught on footage in security cameras but a totally different thing to be in the personal photo album of some random guy’s phone. This guy specifically clearly didn’t have good intentions, and who knows what he plans to do with the photos.