I think the commentor was as much concerned with the namespace pollution: to some people on the left, there doesn't seem to be a "right" (or even a "center"), anymore, only a "far right". This isn't because because they all share the same views, but rather because there's a lack of nuance to the language used by many people in discussing politics.

(I say people because the same thing occurs in reverse when talking about "extremist leftists")