No, I didn’t slander you. My purpose is to warn you not to become involved in the sewing of racial division.
You falsely attributed a base motive to me. That is slander. Or libel. In any case, it is defamation.
My purpose is to warn you to watch your tongue.
I suggest that you should also open your eyes.
And the word you’re looking for is “sowing”, not “sewing”.