These religious protesters man

I know this is considered public property (area by the library and SU) so they can legally be here, but since when is it okay for these protesters to get aggressive and nearly physical with students? I literally saw this guy get nose to nose with a girl who was just walking by. Screaming derogatory stuff at her and everything. I'm glad she stood her ground but what the heck? I really hope she's okay. She left before I could check on her.