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Lefty blog readers know that not all readers of lefty blogs are, in fact, lefties. Someone who wears a handle like "bootedbydailykos" as a badge of honor? Probly wasn't booted for being a card-carrying Communist. Someone probably checked out his comment history and realized he had a record of spouting GOP astroturf.
And there are conservative trolls who show up regularly in the comments of blogs like Eschaton (Atrios) in the guise of liberals spouting ugly language. They are generally outed immediately and virtually tarred-and-feathered.
This doesn't mean that there aren't misogynists who consider themselves liberal, but these folks are out there, and it's worth knowing how to tell the difference between someone with a valid, dissenting point of view, a clueless jackass, and a troll bent on dragging the level of discourse into the mud and smearing us all by association.