What causes fights between two people with two different value systems is not the basic difference between values or ideas linked to their values. The differences in the degree of authenticity in each one of them and the strength of boundaries between them, determines the compatibility levels between them. If one of them / both of them are not authentic, being open to new ideas, discussions and new experiences starts bothering them. If one/both of them lacks boundaries, they start influencing each other and again that causes problems.