That's such a transparent strawman. The point is that a judgement has merit solely based on its justification, not on its syntactic form.
I don't think you can justify prejudice against Jews. People who think they can often use epistemological frameworks I find, to be frank, stupid. At the end of the day, we can judge ideas based on their content, their meaning. The idea that this is equivalent to an irrational judgement, like one based on skin color, is what I am attacking here.
Such as the common one I see on HN: All Trump supporters are racist or all Republicans hate anyone that is gay.
It's just as damaging to our society as racism, yet seems to be perfectly acceptable in many circles.