Regarding what Keith wrote that “who cares who moshiach is, as long as they keep the Torah knocking them is sinas chinam”
No one said we “Hate chabad” that if a Lubavitcher was drowning we would push him down and not save him, not even that we wouldn’t say “Hi” to them (or throw them out of a party (a la kamtza) what (mostly) everyone is saying is that chabad is fabulous except for the “rebbe is moshiach yechi” stuff which everyone else views as very dangerous and would like to save them from it
I wouldn’t be surprised is in the times of the tzedukkim and early notzrim they did the same