There are lots of ways to be wicked. And I try to avoid doing them. In this case it is to basically talk out of both sides of the mouth so to speak. Where you will talk all nice to someone, but in reality you're thinking the exact opposite. Setting up that other person for a huge let down.
There is also a warning to not be caught hanging around people like that, because there will come a time when that association could be problematic. Where you are judged by the company you keep.