No one here says insulting things about the Rebbe. It is his followers that bring shame upon him. If they would just be quiet, nobody would give two hoots about him.
But you insist on making a new religion and foisting it upon the rest of us as authentic yiddishkeit, so yeah, some negative things may come out against the Rebbe, just like they came out against Shabsai Tzvi and Oiso Ha’ish (Not Rav Shach zt”l, the other one)