Slavishly following the Rebbe is only one aspect, and indeed one that’s harder to distinguish from true chassidus so it’s a red herring (or a trollish attempt to bash Lubavitch).
Chassidus, even Lubavitch, does not ostracise those that leave it for another chareidi derech, and enforce entirely cutting off anyone that leaves even from their own family left behind.
That’s without mentioning ask the other cultish aspects, such as the way medication and punishment is built into their system with the pretence that it’s yahadus and halacha.