The poster uses that technique to try and niggle anger from you. He knows when he is lying and uses that technique in his dishonesty. Don’t give him such a benefit of doubt to wonder if it is ignorance or carelessness. He is doing it on purpose.
You mean “agent provocateur.” The incessant RC posting of provocative propaganda could be said to do this, although it has resulted in such being exposed and refuted time and again, by the grace of God. But which includes provoking us to make personal attacks (versus addressing the issue) even if warranted, but thus we need to be more careful even when they do the like.