What's up with all the vulgarity at liberal websites?

The reason I'm asking is a poster named "Thers" at the liberal Whiskey Fire blog referred to yours truly this morning as a "Poor little f****r."

Why was I bestowed such a dishonor? Well, Thers was either displeased with the suggestion that Saturday's announcement of "24" going carbon neutral proves the show not to be conservative, or he disagrees with my view of anthropogenic global warming.

Either way, I'm not sure this qualifies a fellow American as a "Poor little f****r."

As I noticed vulgarity Friday from Markos Moulitsas, the proprietor of Daily Kos, I decided to search for other instances of obscenity from this ilk to see whether this is a random or frequent occurrence. What I discovered was clearly the latter: