I supervise a fair number of people, and am responsible myself for just under 400. At no time would it be appropriate for me to call any of them a coward nor use the expletives that Frank used regularly and publicly. I loved some of his fierceness, but he crossed lines too much for my taste.
Now, do I wish the team played with more fire? Absolutely. But there has to be a better way to motivate than just being vulgar with no real correction. And I use the f-word a ton personally. Just not with those under my charge.