At the end of Shmiras HaLashon (Hilchos Rechilus 9:15), the Chofetz Chaim writes that the prohibitions against Lashon Hara and Rechilus do not apply to reshaim and kofrim and that it is, in fact, a mitzvah to mock such persons
UJM,
I would be very careful to research when and with whom these halachos apply.
Eliyahu Hanovi and Yeshayohu Hanovi were punished for speaking disparagingly about Jewish IDOL WORSHIPERS (the real kind) – because “??? ???”? ???? ??? ????? ????????? ?? ?????”.
(???”? ?”?, ? (?). ??”? ????’ ?, ?. ????)
The Rambam writes that if such great tzaddikim were punished, how much more so a ?? ???? ????? who dares to condemn so many Yidden as ?????? ?????? ?????? ?????? ???? ??????? ??’ ???? ?????.
(???? ???? ?”?)
I would err on the side of speaking positively about Jews.