This is one of the problems with text-based communication. While I personally don't understand how Topolsky translates MG's automotive analogy into "class warfare," these types of misunderstandings are common when people aren't having a real-time conversation. If Topolsky were to talk about this on the phone with either MG or Gruber, he'd find his entire viewpoint changed within minutes. It's very possible that he is attributing "elitist" attitudes where they don't exist, but that's hard to know without a direct, real-time conversation.
I've seen this with my own co-workers on a daily basis. What seems like a contentious conversation via email/IM becomes a complete non-issue when discussed by phone or in person. The difference can be striking.