You should just need to block the community. There's a 🚫 symbol on the sidebar of a community, just click that and the posts should stop showing up on any of your feeds.
If you're on mobile, the formating is kinda fucked so you'll have to scroll to the bottom of the page to find it.
I'm not sure, but since it sounds like they opened the BIOS just to close it and boot normally, I would assume that they thought of it more as a command than an option.
I've seen it a lot since I work in an IT field. Sometimes people think that the computer is telling them to do something when really it's just giving the option to do something.