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No True Scotsman

The Fallacy

Changing the rules of a group just to leave someone out because they did something you don't like.

Why it's wrong

When someone in your group does something silly, instead of admitting it, you just say 'Well, they aren't a REAL member of our group then.'

Example

Real kids don't like broccoli! Wait, Tommy likes broccoli? Well, Tommy isn't a REAL kid then.