Ah yes, the No True Scotsman fallacy. Basically it goes like this.
A: “No Scotsman puts sugar on his porridge.”
B: “But my uncle’s from Scotland, and he puts sugar on his porridge.”
A: “Well, no true Scotsman puts sugar on his porridge.
This fallacy attempts to change the argument so that any legitimate counterexamples can be dismissed as “not true Scotsmen”.
The statement in this image is a sweeping generalization and cannot be soundly defended, forcing the person who made the statement to use fallacious arguments like the No True Scotsman fallacy. For example:
Weeb: “If you don’t watch anime you’re not Japanese.
AAA member: “But Mr. Nakagawa is Japanese, and he doesn’t watch anime.”
Weeb: “Well, obviously, he’s not a genuine Japanese.”