Y'know, I've just stopped caring what is and isn't dubstep. Dubstep, garage, 2-step, post dubstep, future garage, dark swing. Most of my friends appreciate it all the same. Artists don't recognise category divides, put out all kinds of hybrid tracks, confusing matters even more. Good DJs mix it up, go for crowd mood rather than showcasing a genre. It all just blend into each other in a spectrum of sound to me.
It depends what conversation you're having I guess.