Are you insinuating that the ladies are prisses who wouldn't say the word "ass" even if they were sitting on one or had someone being a pain in one? Unlike the natural vulgarity of the "females" on the Left, the Women on FR are likely a bit less fragile than what you assume them to be - your "protective instinct" is probably more of a slur on the Women/Ladies than the guy who wrote the "a" word.
It has been my experience that conservative women are more ladylike and feminine rather than given to cursing like a sailor. Leftist women, OTOH, want to be like men, so they display all of the negative male behaviors while exhibiting none of the many positive male attributes.
Being on line, IMO, makes it easy for one to forget that posted comments are viewed by many people — men, women, and children — which can lead to letting down one’s guard in the language department.