Or maybe because they are immigrants the stakes are higher for them? If they lose the job they may lose visa, so they higher tolerance for BS from management.

Or maybe grow up in a culture that value respect more, so you are biased against questioning the authority.

Or maybe this story is inaccurate/made up. He was put on PIP and requested a transfer at the same time.

Or maybe it's a peter principle at play.

Anyway, I don't think it's fair to post someone's linkedin like that.