It’s a stain on “western culture” if by that you mean European culture and the culture’s like “the American culture” created out of European expats, and when you accept that ALL the antecdents, core sources and influences for antisemtism in “western culture” come from “European” culture.
One has to also recognize that antisemtism in “western culture” is and remains less prevalent in “western culture” where the location is outside of “European culture” today.
Yes. You are right.
In North American, anti-semitism was much less then in Europe.