Politeness is often used to cover up political truths, protect power, and avoid uncovering structural injustices. In this case, politeness becomes offensive.

Demands for politeness are frequently used to give the most obscene ideas a veneer of respectability and rationality, allowing them to stay in circulation

But demands for politeness are also used to shut down the voices of the oppressed (such as by calling them hysterical or irrational), and to protect and maintain the very structures of power that keep them crushed.

One way to objectify a person is to deny them their own subjective, inner life; deny them their pain. They will crush your foot and then deny you first aid unless you can calmly request help, with a polite smile on your face.

Impoliteness can, in these cases, break down the charade of normalcy; it's a scream of pain in the face of those who are trying to deny you your pain (and therefore your humanity)

What's "normal"? We're supposed to live by our persecutor's idea of what a normal level of pain or frustration we should endure, before it's "justified" for us to swear.

Just be heard. Scream if you have to, swear if you have to. Tap into your inner poet or your inner artist if you have to. Just be heard. A world in which you're heard is better - for everyone - than one in which you're silent.