In my experience, there are those who use the ‘neocon’ tag in much the same way that 1930’s Germans used the ‘filthy jew’ tag, and for much the same reason.
And it’s usually not from the ‘right’. It’s the usual suspects among the mouth-breeding, snot-gobbling, intellectually inbred, thumb-sucking left who are p.o’d that anyone can stand against them on any issue at any time.
That explains why Pitchfork Pat uses it -- he's on record that the extreme left and extreme right are natural allies.