Something that usually results from human beings assuming that just because they or someone they know has a certain quality, everyone else in that certain gender has it too.
"My girlfriend is frigid, therefore all girls must be."
"My ex boyfriend is a dick, therefore all men must be."
"The only well-known brilliant people in history are men, therefore women musn't have the ability to be brilliant."
"I can talk heaps more easily to the girls I know than to the boys I know, therefore all boys must be emotionally stunted."
(sexism resulting from self centred assumptions)
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