It's horrible to tell your parents that you hate them.
Patty is getting married to her girlfriend in a week.
Patty wants to have her parents at her wedding.
Patty knows her parents don't approve of her marriage but thanks them for coming to the wedding.
Patty know her parents don't approve of her marriage so at her wedding she tells her parents that she hates them in anger.
Patty's parents see that Patty is happy and enjoy the rest of the day together.
Patty's parents leave the wedding and go home they don't speak to Patty for a year.