this is a really important post, so read on.
Gendering someone is done based on behavioural cues and body presentation (secondary sex characteristics). It is distinct from sexing (see: sexing (verb)).
The act of gendering someone incorrectly is known as misgendering. Misgendering is also the term used when someone intentionally uses the wrong pronouns for someone.
As gendering is such an immediate, pervasive, but often (consciously) unaware act of speculation often, when someone is misgendered, the person who did the misgendering feels misled or deceived, even though the person who was misgendered was not (actively) part of the gendering p