It's a very convoluted reference to "No True Scotsman": https://en.m.wikipedia.org/wiki/No_true_Scotsman https://en.m.wikipedia.org/wiki/No_true_Scotsman ("no

It's a very convoluted reference to "No True Scotsman": https://en.m.wikipedia.org/wiki/No_true_Scotsman https://en.m.wikipedia.org/wiki/No_true_Scotsman ("no true Scotsman would do such a thing"; i.e., those who perform that action are not part of our group and thus criticism of that action is not criticism of the group).