Well sure that's how just about all people behave towards each other. But that's not really the point of the video. The point is WHAT are your 1st impressions of someone based on their appearance. Most of the people in the video who had negative 1st impressions of the others would probably still be nice to them if they met them. The point is that nice or not they have already formed some type of emotional opinion about the person based solely on their appearance.