I wonder why does this concern you whether your art or any art is validated in some other persons eyes? Is it not most important what your own practice is to you rather than what the world thinks of it? Why is it important? JxCame across this article from a guy who does Aikido, basically saying that due to a lack of spiritual focus, and instead a focus that purely revolves around fighting, MMA and similar styles can't be considered "Martial Arts".
Shoshin Examiner Aikido in the Age of MMA
I find such reasoning to be silly, but I would lying if I said I hadn't heard it before from traditional stylists on one form or another.
So, are MMA and similar arts truly martial arts, or are the something different? Perhaps simply combative sports?