My son “hates” it when people curse.
“You can’t say that! You can’t say fuck, you said fuck, you can’t say fuck.”
Rinse and repeat until you apologize. Then he reminds you one last time.
“You can’t say fuck.”
He’s 10, he will confront anyone he hears curse, especially if it’s fuck.
... it’s really hard to type this on my phone... fuck turns to duck every time!

Ducking phone!