I don’t know but I could probably pick a couple decisions by Bill O’Brien in this year’s playoffs against the Titans that would rank up there as the worst ever. Plus they are magnified since it was a playoff game. And trading DeAndre Hopkins is another one ??
While trading Hopkins is a truly stupid decision, it’s a GM decision not a coaching decision...although the same guy has both jobs, he did it with his GM hat on so it doesn’t qualify.