I keep seeing this criticism and I don't get it. Presumably no one knew about his proclivities - not his parents, not his best friend, not his wife (if he had one), no one. It's obviously a very secretive part of his life and it's unreasonable to expect an employer to somehow know this about him.

Meta employes 60,000 people according to a quick google search. I promise you there are plenty of Meta employees who have hobbies and interests the employer doesn't know about.