It's not so much BJJ, it's the UFC types who study it and then put down every other style. I've heard some jerks saying things like "Karate would never work in a real fight you need to learn BJJ and Muay Thai." and that really bugs me, it's like a giant flip of the bird to not only practitioners of other styles but to martial arts in general. Personally, I don't have a problem with BJJ. I do, however, have a problem with the kinds of people don't have any respect for other styles.