That is, in fact, exactly what they do. Erode the
meaning of words, ridicule, ad-hominem, gaslight, declare you an idiot for “not getting their argument,” even though they’ve made nothing resembling one.
It takes much less mental horsepower to be a foolish abusive troll than an intelligent commenter, so in this way they level the playing field.
Then they rinse and repeat ad nauseum until their opponent gives up, and declare victory.