Can't I be both? You think Real fans are not tribal when they play Atlético or Barcelona? I don't see the two as mutually exclusive. There is nothing more painful than watching Liverpool win but there is also nothing more annoying for me to have our team associated with the role of spoilers and game killers. I am tired of watching the best European clubs dominate through pro active football with our teams being reduced to the role of "having to defend well". I could accept the financial disparity if I were a Liverpool or Arsenal fan but when you look at our finances and status, there is no reason why we shouldn't be on the same level as the likes of Barcelona and Real. Watching us, this is absolutely impossible under Mourinho. I know he can win the league, Leicester won it for goodness sake. It is not where I think our ambition should stop long term though.
As for Fergie, I think you are simplifying it to suit your argument. Fergie was obsessed about conquering Europe, not just winning the CL. Looking back on his interviews and books, nothing annoyed him more than the notion that his teams could not play toe to toe with the best in the world. Just look at how he tried to allude to Queiroz being behind our approach against Barcelona in 2008 and not him. He was an alpha and felt United should play with the ego and authority of the very biggest clubs, no different to any other big club really. Of course he could not always pull it off, most of the time, our gung ho approach either cost us or we could not even implement it but that does not mean that Fergie's vision of us was that of a team that should look to be the pro active one, rather than one that only wins.