Good question. I'm not sure why any school has to be proud of the league they are in. Should ACC schools be proud of playing football in the ACC? It is a pretty terrible league, so I don't know.
I do know this, MAC fans should be very impressed with the year the league has had in football. At least three wins against BCS level teams, two teams in the Top 25, one team going to a BCS Bowl, coaches getting plucked out to go coach at bigger name schools, etc. Could be more to be impressed with by the end of bowl season.