Your parents are just people, too. Principles before personalities. Some people are moody and passive aggressive, for instance, but they still have needs, and feelings, and hopes and fears. You should learn to place some healthy interpersonal boundaries between you and your father and pinpoint how he manipulates your feelings. Personal space is important in any relationship. However, failing to meet up with your father, who still financially supports you, on Father's Day of all days just to make a point is childish, immature, and counter productive. You should still meet up with your dad on Father's day even if only for a short time. Acting civil is not too much to expect. You don't have to pour out your heart and soul into the engagement. Just be polite, or even slightly cool. Don't create excess drama. Then again, you might be really young like 17 years old or something and lagging behind in the maturation department. I know I was very angry, resentful, and irrational acting towards my dad at that age. Hopefully, you will learn balance, civility, and most importantltly treating him with kindness before he, or you, is no longer in the picture, and it is too late.