Most people instinctively use 'they' routinely in the singular sense in situations where they are unaware of the gender of the subject: "somebody stole my car but THEY were never caught" or "somebody dropped a tenner on the path, I bet THEY regretted that when THEY realised". So perhaps 'they' is a better way to describe an individual who is unsure of their own gender? I make this point out of either wokeness or kindness depending upon your view!