I'm so angry. I'm going to snap at my mom in front of family
Why are you fed up with your mom?
My mother is an old fool
I'm sorry you don't get along with your mom, but it gives you no excuse to embarrass her in front of the rest of the family. Your matters should be private and between the two of you, not aired out in public like that. It's dehumanizing to your mom.
I don't care. I just want her to see how it feels.
It won't make you feel any better and family will think you are being cruel so don't do it. Wait until the family leaves and if you still feel like confronting her then do it.