

he/she pleases
You can just say “they,” such as, “do whatever they please.”
ETA: oof, downvotes? Seriously? It’s just English, people. It’s easier to write. It’s easier to read. It’s how the language has referred to a single person of unknown or irrelevant gender for about as long as it’s been a language. See #3.
What makes you think I was raining on their parade? “They” is no less inclusive than “he/she.” It is however easier to write, easier to read, and it’s completely common English that every native speaker just naturally uses and understands on a daily basis. There’s no reason to go out of your way to make your message harder to write and read, for absolutely no gain.
ETA: My intent was not to be rude. My intent was to help someone out. For all either of us know, the person I responded to isn’t a native English speaker and genuinely found it helpful.