pedatrician dilemma

My sons pediatrician is a reall ass, so rude to me about the choices I make and just all around uncaring and cold. I've left the office twice crying bc of how I was treated. I am switching pediatricians but won't be able to see the new one until January! My son has an appointment with the old pediatrician for his two month check up on Thursday and I'm not sure I want to go. Would it be terrible if I skipped it an waited until the appointment with the new one? I'm so unsure of everything. 😞