Not being accepting of different lifestyle choices is wrong.
Tucker's daughter Anna is getting married to her partner Louise.
Tucker wants to react to the news.
Tucker tells Anna that he is happy that she found someone she loves.
Tucker tells Anna he will never approve of her marriage because he was raised to believe two people of the same gender should not be married.
Anna and Louise invite Tucker to  the wedding where he walks his daughter down the aisle, and he feels proud.
Anna tells Tucker that he is not welcome in her and Louise's lives and now he feels remorseful for not being accepting.