Did your father just dismiss it off hand, or did you already have a meaningful discussion? Does he realize how strongly you want it? Do you actually associate with a different crowd than your father, or is he right that you might come across as silly and stand out? Is this the only difference between you and your father?
There are many factors that could affect the correct approach.
zahavasdad,
Not always does turning around a sentence prove a point. When someone is asking how he can convince his father to agree with him Kibud Av does not come in. If someone tells his father he wants to ‘downgrade’ that is indeed alarming. If he asks advice how to convince his father to agree, the response would be to get his father to face the facts that he is not following his father’s path. Obviously, that doesn’t go easily if it wasn’t noticed until then.