Of course, it is indeed difficult when a son/daughter is faced with such a predicament of dealing with a difficult parent. It is usually inherent within a Muslim that we want to obey and be loyal to our parents.
However, there could be some parents, for whatever reason (mental, social, cultural), who become not just difficult to be with, but intolerable.
This is all based on the assumption that your judgment, as a son/daughter is absolutely correct, and beyond any doubt based on true evaluation. The reason why I say this is because you might think your father is "dictatorial", but for the wrong reasons.
You might believe he is oppressing you because he doesn't allow you to go out with certain friends, or work in a certain field, or marry a certain individual. In these scenarios, or any other similar scenario, although you believe your father isnt being fair to you, it does not mean he is "dictatorial" or oppressing you.
That's why circumstances would certainly be different, based on the case each family is in.
Seeing that you have genuine requests, and legal requests, try to find other avenues of getting your father to cooperate and acknowledge your rights and your feelings.
Maybe seek intervention, through family members, elders, family counselor, psychologist, and so on.
You cannot just abandon your father, or disown him, but at the same time you cannot continue allowing your genuine requirements to be ignored.
Ultimately, an effective tool is always for you to pray for him, and to pray for your situation.
With prayers for your success.