I might have something to add here. It takes a bit of striking out for context, but if you really want to know what this far-left-barking shit is, bear with me here. Someone even mentions something vaguely relating to that in the REEEEra thread posted about it.
TL;DR: Barking = 'You are racist!' = That person is racist! Attack them!
It's a precursor of what we now know as 'dog-piling', only that it wasn't organic.
The real thing:
http://anti-racism-dog.tumblr.com/
I could salvage the 'purpose', that's the 'explanation' on what it is:
https://web.archive.org/web/20141220144705/http://anti-racism-dog.tumblr.com/about
Even that snapshot is from years after I left that website. And yet they're still going. This is some monstrous fucking dedication that whoever is running it, has.
I was originally going to describe how I came across it many years ago, but I think I actually found the real thing. Unfortunately, it seems to have been cut down somehow and you can't access the live version without a tumblr account, he seems to have deliberately added some option to hide his page from people without tumblrs (a possible indicator of a history of being mocked) and even if you make one and look at it, the about pages and the 'wall of shame' don't seem to be there any more, the account is spending all of today's activity barking at posts about Trump. It's someone who barks at people to accuse them of being literal nazis hiding behind White right wing libertarian ideology and does so in such a gloriously exceptional, broad-brush fashion, that he must be creating literal nazis where there previously were none, simply by accusing innocent and well-meaning people of being ones for not unconditionally pedestalizing his precious pocs.