Should I be insulted or does this count as permission?

I am asking my girlfriend of 4 1/2 years to marry me. We have talked about this and she wanted me to ask her father's blessing. So I asked him and he gave me the answer " I don't care" we were watching a football game and we were talking about football some before I asked and the Steelers losing to Green Bay at the time and well he just said he did not care and I asked which about the game or that and he said both. He really did not seem to care or react. Truthfully I felt a bit insulted and slighted. In a way I care and in a way I don't. I care because I know my girlfriend would be hurt by her father's reaction. In a way I don't care what the heck he says because I love her and she loves me and if she says yes or no is all that really matters. I guess I asked him because there is a minister that works with me at my job, he is licensed but does not currently act as a minister, he said it was respectful towards the father to ask him and that it would go a long way. I really do respect the guy and I have gotten along with him pretty good, at least I thought I did. I was trying to be respectful. Honestly I think he could have just said yes or no not " I don't care" That is like a slap in the face. Heck I would have rather him just said no at least then I could be pissed off I honestly don't know how to feel about this. Why can no one ever in my entire life just give me a straight answer to a simple yes or no question? oh well that is life. I asked him and maybe he just does not care about it but it would have been nice if he would have said yes. He did not say yes but he did not say no. So the thing is I am going to ask her anyways I have been wanting to ask her to marry me for a long time. I love her more than anyone or anything else in the entire world. She gives meaning to my life and makes me the happiest man in the entire world. I can't imagine my life without her. I can talk to her about anything. She has gotten me through the hard times in my life and I have done my best to help her get through the hard times when she has problems in her life. I know that she is the one and there is no doubt in my mind whatsoever. Oh well if in reality her father does not like me then oh well my grandfather did not like my father either and he has been with my mom for a long time. I should have just listened to my father who said don't bother you don't need his permission. My mom though sits there telling me my grandfather has never forgiven my father for not asking for his blessing. So I asked and truthfully if I had to do it over I would not have asked him I would have just flat out told him and said like or not I don't care. I mean maybe I am over yzing the situation but if you ask me I should be insulted and pretty much say the heck with him. Sorry if this is more of a bunch of ranting but I am insulted and hurt that he would just say I don't care. I think my girlfriend is important enough for him to say yes or no not I don't care. I guess the real question is am I over yzing this or should I really be offended and angry. Should I really even care? I swear to god though if I ever have a daughter and she has a boyfriend that comes and asks me about marrying her I am going to say yes or no I am not going to say I don't care. By then though this old tradition will be out of style and no longer important. No one hardly does it anymore now.