Nationalism and all of its manifestations are nothing more then a malignant cancers.
If your going to be proud of something that was never in your hand to begin with, at least it's understandable if it's some glorious powerful nation that has done a lot of good for the world which you contributed towards, or a nation that has at least benefited you personally.
Our country has done none of this but rather the complete opposite.
To show pride in this at the expense of your glorious deen which is the only thing that gives you dignity today and boast about this in public, is the worst form of abomination.