Sounds like a possibility that your dad, while listening to you, may not actually be hearing you. It may be a wise move to write him a detailed letter explaining exactly why your choice of education would be a better option, make sure (as Indy said) to back up everything you say with facts and were said facts were sourced from. I sometimes find that writing down exactly what you mean is sometimes better than a conversation as you can choose your wording more carefully, which is sometimes more difficult in a heated exchange of words.