My sorority has a "blacklist" and any member can add anyone who makes us feel uncomfortable or unsafe. There's this nerdy guy who comes to a lot of our events buy is not in a frat ot any other group we socialize a lot with. He's never attacked me or anything but he makes me wildly uncomfortable. Examples: -I had my phone in my back pocket and I felt someone take it out. I turned around and he was holding my phone and said he wanted to see if I could feel someone steal it so he could show me that it isn't safe to keep my phone in my back pocket. -He often spends entire events sitting in the corner and staring at me if I am nearby. When I look back at him he smiles and waves hello. Once he looked right at me, made eye contact, and adjusted himself in his pants without looking away from me. -He was slidding into my DMs and when I never answered, started saying things like "nobody cares about me" and "I guess I should just die". I asked him to stop talking to me but he didn't so I blocked him and he made another account to keep messaging me. I asked our standards chair to blacklist him. The member who invites him was informed that he was not allowed to come anymore. She got upset and sent a message to our entire sorority accusing the person who blacklisted him (me, though she doesn't know it) of being a bully and discriminating against her brother because he has autism.