If your wife brings home some baggage from work always side with her even if you do not completely agree.
In marriage council our minister told us that marriage is like a fight. It is a fight with the man and has wife as tagteam partners fighting a handicapped match against the rest of the word. Your wife has to feel and believe that you are on her side regardless of how right or wrong she may be. You have to support each other and then if needed discuss it later, after the emotions have cooled.