There is an emerging view that the term “high conflict” oversimplifies the nature of destructive family dynamics, especially with respect to the small but resource‐intensive group of separated parents who remain deeply enmeshed in legal battles and parental acrimony. In this Article we propose that interparental hatred may be a key relationship dynamic driving the behavior of some in this group. We suggest a distinction between two types of interparental hatred: one that arises from responses to separation‐related stresses (reactive hatred) and the other (entrenched hatred) that is indicative of more embedded, dysfunctional interpersonal dynamics and/or personality structures. While reactive hatred is typically time limited and amenable to professional intervention, entrenched hatred tends to overwhelm rationally informed attempts to mediate, negotiate, or even adhere to orders regarding suitable parenting arrangements. We contend that while effective intervention in these cases requires all the generic skills and responses necessary for dealing with highly conflicted disputes, it is also important to name and appropriately challenge interparental hatred when it is detected.