Isn't "they" plural? It's just one person. "it" is actually gender-neutral, singular, and even shorter, but feels like it should only be used for objects and no

Isn't "they" plural? It's just one person. "it" is actually gender-neutral, singular, and even shorter, but feels like it should only be used for objects and not people. Turns out it's a "he", so if we are focused on technicalities I should have used that, but for some reason I can't edit the comment.