The English language has well over a million “official” words in its dictionary and probably another twenty thousand or more unofficial, idiomatic, and/or regional words that are used by specific groups and have meanings yet to reach any dictionary.
There is nothing you cannot say in English using real words. You can make yourself heard while speaking a language other people will recognize. Not only will this not diminish your communication, it will enhance it while lending you credibility with other literate people.
If there is nothing you can say without insulting and hurting people? Without hate speech and slurs? Best say nothing.
Hate speech and bullying isn’t freedom. It’s hate speech and bullying. It is always ungrammatical and makes my brain itch. Everyone recognizes the invisible lines of what’s acceptable speech and behavior and what isn’t. I think we know this much by the time we get to first grade. The people who regularly cross these lines know exactly what they are doing and why they are doing it. It isn’t lack of education. It’s lack of empathy for others and that, sadly, is a disease for which there is no known cure.
The speech of the bludgeon or truncheon is no accident. Those who speak thuggish do it with full intent. It’s wrong. You can argue this point until the cows come home. It will remain wrong.
One of the things I’ve always admired about the British upper class — maybe the only thing I admire about the British upper class — is their ability to be perfectly polite while verbally eviscerating their opponents. It’s an art form. They at least understand that a rapier — a sharp, precise tool — is a better weapon than a bludgeon. And usually leaves less of a mess.
If you have to join the fray, put away the bludgeon and give the rapier a try.