The vast majority of his posts? Or the vast majority of his posts that register with you? I make out 2 of his last 30 posts criticizing conservatives for being anti-minority (race/nationality) or anti-majority (gender). 2/30ths, except in certain well-designed Texas districts, does not constitute a "vast majority".
Well, it's a hell of a lot more than 2 out of his last 30, but I'll admit to using a little poetic license (I was wondering if any nitpickers would waste time arguing about it). Regardless, it is an extremely common theme - and is subscribed to by
the vast majority a significant fraction of liberals.
From the standpoint of practical experience, though, it is a weird myth. I think that even for people at the extreme, unhappy end of the bigotry scale bigotry is a weak motivating force in their political beliefs and day-to-day actions. One proof of this is that even bigots are often friendly with certain individual members of the group that is the target of their bigotry (e.g. "oh, he's one of the good ones.") Life is too complicated and too difficult to afford spending a lot of energy trying to hurt another group of people just for the hell of it, as opposed to advancing your own interests. Now, it's possible that both drivers would lead to advocating for the same policies, but certainly not always, and certainly not to the same degree.
Ironically, if there were an anti-black racist who understood economics and whose primary motivation was to hurt black people as a group, he would probably advocate for liberal policies which, on the whole (in my sincere view), undermine the black family, increase the supply of unskilled labor, decrease the demand for unskilled labor, reduce the incentive for people on the lower end of the wage scale to work, create double standards which only exacerbate racial animosity and stereotypes, and indulge and cater to a debilitating sense of victimhood and racial grievance.