I don't think that partiality is a positive trait and it could lead to any positive result. Therefore, it is good in no sense as it will only create disharmony among people.
Medically speaking, you are exposing yourself to a greater (but very small) risk of bacterial infection or virus by "making out" with people, making it 'bad' for people. Culturally speaking, however,...
There is good people and bad people because some people have sick minds and some do not. Real Answer: If there is no bad, how can we define good? Another Answer: There are good people and bad people...