When someone tries to protect a woman or a man within a couple (outside of abuse of course) and supports one but not the other, they are in effect placing the person they are protecting under a pseudo parental authority. They are withdrawing them from the authority of their own home and going against the word that state “a man will leave his mother and father and be joined to his wife”.
They are initiating a spiritual divorce by undermining the legitimacy of the spouse and not supporting the couple as a unit.
The root of this behaviour is judgement. The result can be arguments, jealousy, strife rejection and/or separation (emotional, physical or both) either temporary or permanent of the spouses.
A couple should always be supported as a unit, it is unwise to give support to one and not the other, this creates a context of rejection, favouritism and even competition for affection between the spouses, basically, it divides instead of uniting. Supporting the unit brings strength and hope to both spouses and courage to move forwards together.