Certainly, the right-wing posts on AB seem the ones most likely to show lower literacy, bad spelling, poor syntax, etc, compared with the left-wing ones.
I'd be interested to know how the topic poster has arrived at the "more AB left wingers" conclusion. In my experience the right-wingers, plus some I'd pretty much classify as bigots, seem the most numerous and vocal on here, but maybe you tend to notice opposing views more.
By the way, by the same token that the poster says right-wingers get besieged by the same old accusations by lefties, you don't need to oppose a right-wing view on here anything more than mildly before you're dismissed as a pinko do-gooding Guardian-reading museli-munching bleeding-heart etc etc etc liberal (yoghurt and museli crop up a lot in those posts)