I'm a huge pop-rock / rock / alternative music fan and I wouldn't say I'm pretentious. One thing is what I think in my mind and second thing is what I can say out loud. Even though I must admit that some genres seriously aren't "real music" to me... but who cares what I think
As long as some EDM die-hard fan doesn't talk **** about rock, I don't talk **** either. Maybe that's just me though, I was taught to respect others' opinions.
Oh and as others said before, you can say the same thing about pop fans. Fans of every genre are pretentious, because everyone thinks their taste is the "right one". Not all of them, of course.