A fashionable alienation whore is person who exploits a given alienation, just because it is popular (or, conversely, unpopular, but "cool").
A prime example of this presently would be the people exploiting the goth culture. Wearing black and dying their hair not out of any sense of creating a personal identity for themselves, but rather to be alienated. Fashionably.
IE: "Let's go to a cafe and act like we don't want to be there"