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Raj, this isn't merely about "hypocrisy" as it is about pure incompotence. As said before the point of the post is basically that Howard Kurtz sorta sucks. Indeed that's kinda the problem many people (and not just "liberals", as the right-wing stenographers like mindlessly repeat) have with the administration as a whole.
As for the notion that "we" shouldn't argue that "they" are bad...the problem is that this argument is structured in the tired dichotomy of "liberal/conservative." Instead it should be reconfigurated in the dichotomy of "concerned citizens/political & journalistic buffoonery and laziness." Let's see how many people join that "side" when the debate is structured THAT way. When people have a job to do (especially if it's one serving the public) they are expected to do it well.
As for the issue at hand, the Right-Wing spin machine isn't whining about "hypocrisy" here. They save that shit for when people like Glenn exposes their inane claims. They're "problem" is that commenters (as many people already stated, we have no evidence that these were "liberals") on a blog wished he was dead and this somehow "proves" that liberals are evil people who eat babies. Glenn's take is that that line of overplayed hand-wringing is just plain dumb.