I fear becoming like my dad.
Why are you afraid of becoming your dad?
Because my dad is a closed-minded bigot.
It's reasonable that you don't want to become your dad because he's a close-minded bigot, so you shouldn't become like him. You should try to model yourself after someone you admire in order to become a good person.
I'm going to talk smack about him to others in order to see how long it takes for him to notice.
It is more important to live your own life and be positive to everyone.  There is no need to stoop to their level for any reason.