Technical people know about this stuff, and designed it to trick people who don't know about it into thinking it's benign. But sure blame the user. Seems to be a favored go-to for Facebook.
Turning off one's microphone is not so uniformly easy that failing to do so justifies the epithet "stupid." Sometimes you can only deny permission to use the microphone, not turn it off entirely. Sometimes permissions are reset in an update. With several devices on different platforms, it can be hard to keep track. And then, others around you may have their microphones on, and voice recognition seems to work.
