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Singular they rule
(pawb.social)
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Actually, I was referring to 'it.'
People don't like using it for people, because it's traditionally only really used for objects ("It's a chair!" ) or creatures where the gender isn't identifiable or doesn't matter ("It's a bear!") , but that's the exact use case here.
A nonbinary person is a creature whose gender is either not identifiable or doesn't matter.
People just decided that it meant nonbinary people were objects, when in reality we use it for objects because they were the only truly nonbinary concepts we had.
Some people like to be referred to as "it", me included. It's not super common though and generally something you don't assume for obvious reasons.