Why identitarians are offended by discussing the whiteness of Jews

The reactions to yesterday's post,For anyone who thinks Jews were not always white in the US, surprised me. A Jewish friend said I was showing "an unfortunate bias" for suspecting that Chesnutt was right about Jewish wealth in the South in the 19th century, and someone linked to the post through http://www.donotlink.com/framed?727825so it would not get any Google juice and their readers could