That combines the questions of "are they anti-Semitic" and "if they are anti-Semitic, how would they phrase it". A right-wing anti-Semite is more likely to phrase it that way than a progressive one, even if they are both anti-Semites.
Since you choose not to tell me how a progressive anti-Semite would tell people he hates Jews, I assume you have no good answer for that question. The most charitable interpretation I can think of of your point is that a right-wing anti-Semite is more likely to be open about his hatred of Jewish people; that a left-wing anti-Semite is more likely to express his hatred of Jews through the three D's: delegitimization of Israel; double-standards for Israel; and demonization of Israel. He might not even be fully consciously aware that he hates Jewish people...
Suppose I told you that I knew for a fact that the following statements were true:
You’d think I was crazy, right?
Now suppose it were the year 1901, and you had to choose between believing those statements I have just offered, and believing statements like the following:
Based on a comment of Robin Hanson’s: “I wonder if one could describe in enough detail a fictional story of an alternative reality, a reality that our ancestors could not distinguish from the truth, in order to make it very clear how surprising the truth turned out to be.”1
1Source: http://lesswrong.com/lw/j0/making_history_available/ewg.