I think the better question is why do people think racism is wrong, but bias of an entire group of people based on their political/personal beliefs is okay.
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.
Okay, so If I decided to not hire any liberals or anyone that supported gay marriage...and got big companies on board, this would be acceptable to you? You can always change your beliefs......
Do you really want to try to make the argument that prejudice against skin color is the same category of thing as disagreeing with ideas?