Well, to be honest, it shouldn't really matter cuz this is kind of a ridiculous fandom and we shouldnt take ourselves too seriously.
This is a bit off topic, but like for someone who's gay, are we just supposed to quit using the word "gay" and refuse to acknowledge that they are different from the heterosexual majority? It's not necessarily descrimination, it's just who they are and the label isn't necessarily bad.
I guess it matters on how you use the term "brony"--same with "gay."
I think I'd prefer Read It And Weep to Sonic Rainboom as a first episode, too. SR seems like you'd enjoy it more if you knew the characters a bit. RIAW has a nice message at the end for people who haven't seen the show =P