Proper English language usage
As time goes by, a language has additions to its trove of phrases and idioms in common use. Some of these are good additions, some are bad. This site warns about a few bad uses, and gives a little insight into why the good ones are so good.
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Many people are unaware that the word incredible merely means 'unbelievable'. Modern usage has promoted this word to be used by itself. In many cases it will make the speaker appear to be a buffoon. When that happens, it is left up to the audience to figure out whether the speaker means incredibly good or incredibly bad.
Good use of incredible by itself:
Remembering what an habitual liar he was, I assumed his story was completely incredible.
Bad use of incredible by itself:
He delivered that speech flawlessly!Incredible!
Here, the reporter may think the orator was replaced by Animatronics. Because of past mistakes by the orator he believes the orator could not possibly have delivered the speech.
The reporter may think the speech was delivered well but the content is not to be believed.
The reporter is stupid enough to equate the content of the speech with the delivery of it. In such a case it is impossible to tell what the nincompoop means.
Most of the time, it is better to say what you mean. If you mean to say that something is incredibly bad, just say so. If you merely say it is incredible, there is some social justice warrior out there who will mistake your meaning. By the way, for every social justice warrior who says you should be ostracised for being 'X', there is another social justice warrior on the other side who thinks you should be ostracised for not being 'X' enough. It is my advice that you ignore them all. If they still bother you, paint "I aM A raCISt" on the side of their car. After they are forced to leave the State, you will be left in peace.