What is the ruling on distancing oneself from parents who quarrel and cause psychological and social problems for their children, and is such distancing considered an act of disobedience?

Boycotting parents is an act of disobedience and a severing of kinship ties. It is obligatory to treat them kindly, even if they are disbelievers. Do not think that boycotting will solve the problem; rather, it may complicate it further. If treating one of them kindly displeases the other, then treat both of them kindly without informing the other. Advise your parents in a gentle manner, and strive for reconciliation through mediation by someone who has influence over them, and do not despair.