Farby, i hooe you realize that lubavitcher rebbe stories (there are thousands) come only from chabad. Chasidish gedolim such as the poskim cited above don’t quote him in their teshuvos, let alone the litvishe poskim. Outside of chabad, MO revered him as a tzadik, as did sefardim who flock to kabalists, but few gedolim acknowledged him as anyone significant. Rav avigdor miller did, but in his later years stopped referring to him in mesholim of tzadikim and generally understood why the yeshiva world, led by rav shach, was opposed. Rav pam also originally said that rav shach is “talking to bnei eretz yisroel” but later was chozer.
It’s only laughable if one lives in isolation. Where i come from, the lubavitcher rebbe is not considered a gadol. Rabbi kook and rabbi yoshe ber Soloveitchik are held in higher learning esteem, yet are not accepted due to their divergence from mesorah.