The generation gap may be part of it, but if he's flying off the handle over your mum not getting him Mentos and throwing a fit as a result. Or freakin' out of the food wrapper, sounds like emotional abuse to me...especially if he does similar stuff a lot.

You are not evil for not loving him because of his behavior. I don't think he's evil, just messed up. My dad grew up in similar situation in rural Georgia. But he didn't treat me or my sibs or mom like your father treats you and your mum. Imho he needs help and so do you and your mum. There's nothing wrong with getting help for the abuse.

*hugs* Hang in there kiddo and know that I'm only a PM away if you EVER need anything. You are an awesome person, period. Let no one tell you differently. *hugs*