People in your life do not magically become more annoying during the holiday season. The problem is that we crank our expectations to unrealistic levels during the holiday season. We erroneously believe that our loved ones will cease and desist with regard to their standard trifling behavior.
However, more than likely, they will not deviate from their normal conduct.
No need to argue and get all dramatic about it.
Breathe and get through it. January will be here before you know it.