A friend of mine once told me that he was putting "female" everywhere he was asked (in social media etc), for privacy reasons
It's his right. His gender identity is his business. He has the right to self-determination and if it's convenient for him, no one has the right to forbid him. But if he leaves his Twitter profile where he communicates, where he has a beard and drinks beer - then let him not complain later. This is considered gender cheating on any respectable forum.