On many forums on the internet, many times you see the claim that kinksters are more in touch with their sexuality than 'vanilla' people so vanilla is often used as a derogatory term.

I don't think kinksters necessarily are more in touch with their sexuality and I've come across just as much kink outside the sphere of people who label themselves kinksters.

It's a life style term and like all people who like to see themselves as having a different and unique life style, they want to set themselves apart by having their own 'in language'.