When people talk about EDM it makes me think of the kind of popular stuff that they might play on mainstream radio. Dance music that people would go and see at some corporate sponsored event in a stadium, dance music that your Mum might hum along to, dance music that they play alongside the likes of Robbie Williams in those horrible no trainers clubs in town, etc...
I guess the reason is that whenever I see the term in the press it's generally alongside names like Lady Gaga, Tiësto, David Guetta, Skrillex, Swedish House Mafia, even the Black Eyed Peas. Fuck there is even Justin Bieber posted with an EDM tag on reddit.
But you know pop-dance music has always existed. I never liked Fatboy Slim. The Chemical Brothers quickly got boring when they started colaborating with the likes of some guy from Oasis.
I'll just continue to ignore it :P