Let me play Devil's advocate.
Let's say that it is escapism (and yes, to a degree, it is), as long as one "lives in the real world", but also adheres to a certain fantasy/subculture/interest, then what does it really matter? Most people I know (including myself) who have interests like this (be it the furry fandom, Otherkin, anime, video games, cosplay, etc.) do live in reality. They pay bills, have jobs and contribute to society. They just so happen to like to ,on occasion, escape reality by means of their particular interest. To be honest, I can understand why. Reality sucks in many ways, and most people (whether they admit it or not) have forms of escapism that they adhere to.
It's all about balance. Live and let live, but don't let it be your only means of existence. Otherwise, do what you will.
My 2 cents anyway.