Words change in meaning. Divisive used to mean dividing people unnecessarily, or creating dissension. Admittedly, that would always have to be subjective. Even when applying that precise a value, one would have to acknowledge that the person or group being divisive doesn't see themselves that way. They see themselves as being right - as reformers, or remnant believers, or fighters for principle. Each could see the others as the truly divisive ones.
Still, we seem to have drifted to a meaning of "won't do as we tell them." Submitting evidence of the other being the primary initiator or primary offender is not even given a covering statement. It is a word now used to conjure rather than describe or explain.
Perhaps it was ever thus, and I was less observant.