It goes something like this: “Jews boycotting other Jews is a disgrace! Jews who call for a boycott of settlements should not be welcomed into the Jewish community!” — ie, we should boycott them.
Apparently the internal inconsistency of this argument has not dawned on Mr Liebler.*
The editorial correctly expresses consternation that the South African government is creating an atmosphere in which bullying Israel is considered perfectly legitimate. Surely the Diaspora Jews who indulge in similar activities should likewise be fervently condemned for conducting hostile acts against their own kinsmen. The suggestion that the vast majority of committed Jews in the Diaspora, as well as Israelis, should welcome Jews calling for such boycotts into “the big tent” if their “motivation” is deemed to be “well intentioned,” is thus idiotic and unconscionable.