I'm going to call my mom selfish a week before thanksgiving
What did your mother do to make you believe she is selfish?
She isn't making my favorite Thanksgiving dish.
We all like to eat our favorites around Thanksgiving. However, just because your mom can't make your favorite dish there is no reason to call her names. Pitch in to help your mom instead of complaining.
What the hell? So maybe I won't complain while I eat because she isn't making my favorite stuff.
That's the way to do it, you need to realize that Thanksgiving isn't about the food, but instead the people that you are spending time with. Your family is extremely important and at this time of year it is good to use it as a time to be thankful and remember that.