Everybody has their own way. Being an optimist or a pessimist doesn't make you more or less of a fan. Only you can know for sure. Do you get butterflies at kickoff? Does your heart hang on every play? I don't care if you don't think we have a shot, or if you think there's no way we lose, if you're not 100% invested at game time, then IMO you're not a "true" fan.
Personally I don't think a "true" fan or "real" fan exists. They are mythical creatures like unicorns and leprechauns and vikings Lombardi trophy polishers. I certainly don't agree with your definition of one. I've missed plenty of Packers games over the last few years as I have had things going on that I thought were more important. I've switched to the red zone channel many times and not gotten back in time to see all the plays. By your definition I'm not a true fan. So be it. I used to think that a "true" fan would NEVER root for his team to lose just to get a higher draft pick. Now I realize its just one fans way of rooting for his team and his hopes for improvement. I still don't agree but I will no longer consider these fans any less passionate than I am. I know guys who you probably would consider true fans and if they are the company I would have to keep to be considered a true fan I'd be honored not to be one.
I'm probably over reacting to your comments and I mean nothing personal. It's just that few things get me going more than when I see or hear someone telling me what a "real" fan or a "true" fan is.