Everyone should be proud of the school he or she came from... You can attribute your success to your personal drive and ability. That is your opinion. And no one can take that away from you. But please bear in mind that your school and your mentors, with all their good deeds, intentions and shortcomings have molded you to the person you are now...
I came from a "good high school". May not be the best out there by any academic metrics, but it has exposed me to a good number of good and evil in this world, which has made me a better person, ready for the world.
I would like to see people proudly wear their school colors. I have profound respect for them. Just goes to show that they continue to appreciate that they spent the best years of their lives with the institution and its mentors...
If I were to choose what school color to wear at any given time, I would choose my regular high school over the other so called "world class" local institutions which I have attended...