One of the most common misconceptions I see people have about Japanese honorifics is that -kun and -chan are gendered. They can both be used to address a person of any gender but -chan implies you find the person endearing/cute which is why you hear it more for women and children. Men and boys are usually only addressed with -chan by very close friends and family.
@TapiocaPearl Can confirm: I have been called -chan once, but then the person realised they made a faux pas because of my seniority, and corrected it quickly to -san
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