There are two problems. First, the term "authoritarian dictatorship" is not as well-defined as you seem to suggest, and carries a pejorative meaning which is separate from any factual information it does contain. Second, the comment was too short to convey much information in its own right. When people post pejorative, low-information comments about inflammatory topics, that's flamebait, whether or not they intended it that way. I'm sure that driverdan had no malicious intent, but intent doesn't protect a dry forest from dropped matches.
I can understand why you would be frustrated by this response if you look at the comment as an atomic, standalone thing. But comments on internet forums aren't standalone. They're prefixes of the subthreads that follow from them, and commenters are partly responsible for what follows from their comments. Certainly they are responsible for following the site guidelines, which distill much of what we've learned over the years about how to comment in ways that don't lead to degenerate subthreads.
