The functionalist theory states that society is a complex system whose parts work together to promote solidarity and stability. Mean Girls show that the "plastics" are on the top and keep everyone else in line somewhat because they are the people that does everything right.  The relationships that the girls saw in the end was it doesn't matter how "cool" you are, being happy is good enough and with the right friends and people that make you happy. Being yourself.  a con about this that it does group people together like the jocks, plastics, athletes and ranks them. People should not be ranked on the social class.