This about sums it up.
The conflict between maturity and education is eloquently summed up here:
http://greenhornetlk.wordpress.com/2007/11/05/education-and-maturity/
Technically the dialog has gone as far as to recognize certain dichotomies within the Kantian world view (specifically the social contract), and how the social contract is in turn translated into educational systems. These educational systems operate often times as not so much teaching instruments to facilitate wisdom but enculturation instruments which facilitate a homogeneous cultural outlook.
What you seem to be experiencing is the difference in outlook, which is going to be directly based on personal experience and perspective as opposed to others personal experiences and outlook. In the west sports teams and supporting a team is directly tied to supporting the collective efforts of a particular region and in turn a regional identity. Not supporting that entity could be perceived as being antithetical to the identity of those that do support it, and as such immediately categorizes oneself as an outsider to the "other".
This is clearly a two way street as you yourself are now "burning with rage".
My own personal solution was to identify the extent of the social contract and it's applicability to my person as a consequence of living in a civilized society.
That is, that "we have as much contract as we are social".
Accepting the reality that one will likely not get along with people one may then upgrade ones own sense of personal preservation by enrolling in a martial arts study, acquiring a fire arm, and or hitting the gym and weights. Upgrading one's "small" talent for war into a "large" talent for war will reduce most of this animosity and insecurity.