DickRod didn't say it.
What coaches do or do not say is irrelevant.
It should NOT be a part of a team chant, condoned by the coach. Period.
It doesn't matter if a coach uses an expletive at an emotional time during practice or a game. It doesn't make that coach a bad person or a bad role model. We've all done it in the heat of battle. However, it's ignorant to use that to "lower the bar", and is incredibly poor leadership, as a leader of young men, to permit/condone/approve of the use of vulgarity (like "STFU!") as part of a pre-game ritual.
Again, it's not that hard, and the fact you're an advocate for it causes me to wonder why I'm wasting my time with someone so out of touch to think it's okay to create such an environment. You might choose to live your life like that, and think it's okay to tell young men to make that a part of their regular vocabulary.
It's not. And, if you're being honest when you say you don't care for players doing it, then don't excuse DickRod for being an advocate for it.
A "mope", huh? Somehow, I'm getting a clearer picture why you're okay with such vulgarity.