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[ame=http://en.wikipedia.org/wiki/No_true_Scotsman]No true Scotsman - Wikipedia, the free encyclopedia[/ame]

It's a fallacy where people refuse to accept that their group is capable of doing bad things, basically.
Person A: "No Scotsman puts sugar on his porridge."Person B: "I am Scottish, and I put sugar on my porridge."Person A: "Well, no true Scotsman puts sugar on his porridge."Switch scotsman with GGer and porridge with makes sexist attacks.