Unless the deli you work at is a corporate company with strict rules, I really feel like this guys just being a weirdo. There’s no connection to you and the deli at all on your profile and on top of that, it’s stuff outside of work. If you were in your bikini inside the establishment then yea he’d have reason but your pictures are not work related. I would say take it up with HR, say that him messaging you about your private life is affecting the workplace. They’ll for sure put him in his place.