You should be nice to new people you meet.
Joe meets a new person for the the first time who introduces himself to Joe.
Joe wants to say something to the person.
Joe compliments the person he just met and tells them to let Joe know if they ever need help with anything.
Joe tells the person that he just met that they're kind of ugly and don't look to bright either.
The person Joe met is happy to have met such a nice and helpful person as Joe.
The person Joe met is really offended and never likes Joe after that.