It attempts to address patriarchy and misogyny through the prism of a plastic doll which has contributed towards the objectification and poor body image of women for years. It then reverses the situation and seems to suggest that misandry is preferable, and objectifies men is a shallow and stereotypical manner.
I had no idea what message the end of the film was attempting to communicate, but I suspect it has achieved its objective of selling more pointless, plastic tat to consumers, further lining the coffers of huge corporation who actually couldn't give a shit about the world we live in as long as they make lots of money.
So, basically, I didn't understand the point or purpose of the film on any level.