With a measure of time, a counterpoint -- patriotism is that essential glue which holds together a pluralistic, multi ethnic, multi religious, multi cultural society.
Can it be corrupted and do excesses poison? Absolutely.
But can such a society survive without it? I say no: there's too much tendency for groups to fragment and revert to an us-vs-them, uncompromising mentality.
That said, my American patriotism is of the 'disapprove of what you say, but I will defend to the death your right to say it' variety. Which is a different flavor than the en vogue militaristic machismo bullying.