I do not like the man my mother is dating, should I be honest?

I want my mother to know my true feelings but I also want to be supportive of her. She is happy with this guy and I don't want to cause tension. However I REALLY do not want to be around her when she is with him. I find him terribly annoying and condescending. They have been dating for about a year. I do not live at home but I do see her about once a week. I have tried my best to avoid him but now for the holidays she wants him to be very involved in our family get togethers..more than I am comfortable with.