Stop dumbing yourself down so others will accept you.
Dumb yourself up without being arrogant or using words that you know in advance nobody will understand.
The point is to communicate effectively.
When you use slang all the time, that signals LAZY to your listener.
LAZY in the speech. LAZY in the mind.
That’s just the way it used to be.
Now is different.
Because now you slang it only for effect, and only rarely for effect.