Ummm....Janie.... pdq's first two posts were personal attacks on Mrzzy's basic character.
You suggest that: "pdq's reactionary reply is absolutely no different from the frequently seen knee jerk reactions of some of us liberal and left leaning posters when a conservative or right-winger posts a similarly outrageous assertion."
1) It IS different from most replies I remember seeing insofaras it adds language like " moronic, hateful, Anti-American crap from one of Mudcat's more pathetic bigots.", that is personal attacks that sometimes get entire posts deleted.
2) It is a basic error to suggest that others "would have" reacted similarly in imaginary circumstances. A pre-emptory ad hominem?? *grin*

Mrrzy started on the wrong foot...pdq escalated it by name calling instead of simply debating the point and providing counter examples as several others did. Like some of the actual donnybrooks noted in the links, this group has slipped into a virtual version. Good thing there are no chairs or bottles to be wielded here. ☺