In Japanese, referring to people as "it" considered rude. Instead of "it", We say "that person" or information of the person (ex. a person who wares a blue shirt).
In English, Is referring to people as "it" considered rude?
Pronouns – Is Referring to People as ‘It’ Rude
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Best Answer
English doesn't have the same kind of strictures regarding how to reference people as Japanese does. We don't, out of politeness, refer to people as "that side" or "next door" (the way my Japanese in-laws do), but we definitely don't refer to people as it unless we are being extremely rude or condescending. Even then, this is something that would be said only in the heat of anger, and would be hard to take back.
Even babies are called he or she if the gender is known.
At all costs, avoid referring to someone as it.