I have a "friend" that likes to talk shit and I have put him in his place and frightened him many times, however in the past when I would talk to a girl he would always talk to her too and try to get close to her. He did this all this year but he gets friend-zoned therefore, I'm not concerned about him stealing a girl but instead cockblocking. We're going on a school trip to Greece and Italy and the trip includes a one week cruise, so I'm thinking is it worth to fuck with him and cockblock and steal any girl he talks to?