There is no such thing as "lashon hara against Trasher Mecca". His teachings he claims come from a heretic "kabbalist", he murders Jews in Israel with his words, his smicha is fraudulent, and were it not, then it would be invalid for his false conversions and the lies he spreads about Israel. If you don't speak against him in any conversation he arises, unless all parties are guaranteed to be aware of this enemy of Judaism, you're punished for the evil he does. YS"V to Trasher Mecca. Btw, he claims he is justified in spilling Jewish blood in Israel because Satmar does, and if so, then he should get off the internet, but I have no doubt that he is really just a liar, and an enemy to the Jewish people trying to get in more fake converts to destroy us from within.