Being sour toward another team's success—especially if that team is your hated rival—is part of the fan experience.
Not to mention that differentiating between teams, strategies, outcomes, the way a series or a season unfolds ... why are we all here talking about this sport if not to do that?
This is like arguing about the meaning of MVP.
There's no way to argue over who "won" MVP in any given season. But we can always argue about what the MVP award means.
The only thing a title means from a concrete perspective is that the team won 4 best of 7 playoff series in a row.
Any meaning you place on it, including what it suggests about the team or the players involved, whether it means that team was the best team in the league that year, or anything else -- all comes from you.
That also includes, by the way, caring about whether your team won a title. Why does winning a title matter? The only way to answer that is to provide an explanation of what it means to win a title. That's inherently subjective.