Since when is dubstep so popular in America?

A lot of the songs on the radio in the States now have that dancy/club beat to it which I think is complete crap; save those beats for Tiesto and Guetta, not Chris Brown. Most kids here know what dubstep is, claim they love it, and so on, but are completely ignorant to any djs of that genre.I'm originally from Greece and moved to America about a year ago and quite familiar with electro/house/dubstep/etc. music scene. When I mention names like Jack Beats, Rusko, Fake Blood, and Subskrpt when talking about dubstep; people look at me like I'm from outer space. It's just a fad that is easily going to die down in no time.