What would you say to someone who doesnt support nationalism?

I think that this is a very narrow viewpoint. Being devoted to ones country does not have to be a negative thing. Now granted zeal ousts have a tendency to make a country look bad and yes, we have plenty of these in the US too. It's not a country willing to do things it's people. Maybe a corny cliche or bad metaphor but as the old saying goes guns don't kill people; people do. I think the message gets lost in anti-nationalism about governments, flags, and symbols VS focusing on discussing the real issue which is the nature of humankind. It's great capacity to do both good and evil regardless of nationality, creed, or gender. As they say it only takes one bad apple to make the whole look bad and from there the profiling begins.