Hermes, & I pseudo-quoting the guilty, "You're not angry until you're swearing like a sailor!"
We were telepathically bonded while shouting it amusedly, so it was shouted as though one.

Most low brow people, in our experiences, don't recognize anger until profanity is used. And, when they know they're angry, they make a point of dropping it like it's hot, because they think that's how you express anger.
Yuh know how in Japanese, you have to carefully format your sentences in expression of various things? They think English has a rule of that kind of having to swear to signify anger.

Some of them have this belief because they're narcissists who are in denial that they angered the other person.
Others, learned the fake rule from the narcissists.