I haven’t noticed that, but maybe I’m not looking hard enough. I’ve certainly seen more Jew hating in the comment sections of Breitbart articles, but I don’t regard that as an anti-Semitic site.
Andrew Breitbart was himself Jewish. The current CEO, Larry Solov, is Jewish. The Senior Editor, Joel Pollack, is Jewish. The Breitbart mission statement is explicitly Zionist.
Thus it’s more difficult to blame Breitbart for anti-Semitic bigotry, regardless of some of the posts in the comments section.