Do people not know what "man" means?

Dictionary: man noun

an adult human male. synonyms: male, adult male, gentleman

a human being of either sex; a person. synonyms: human being, human, person, mortal, individual, personage, soul

Surly the 2nd definition is most commonly used in terms like Fireman, Policeman, Mailman, etc.

So why did Princeton University remove this word from their university?

EDIT: Thanks to DCarrier for Answering the question. The connotation the of the word "man" is masculine and showing to others that they feel default humans are not bound by sex is something that is appealing to Princeton University