Nothing serious that is said in a relationship should be viewed by the other party as stupid and over thinking. Once you start to think that the other party is sprouting nonsense about the r/s then the mutual respect is gone and it will go nowhere. 

Because everything that is said about 'us' in a serious manner is something that really affects one party therefore it shouldnt be taken lightly. You can joke about it but don't ignore it and be quiet just because you think its stupid to tackle.