Wave That Flag, Wave It Wide and High

There's a link rich post up at Daily Kos on conservative outrage over the prevalence of Mexican flags at the recent protests against legislation that would crack down on illegal immigrants. It got me thinking about a little thought experiment: Imagine you've got a community of proud Americans living abroad for whatever reason, say in England. And suppose that even if they're perfectly happy there and doing what they can to fit in to their adopted society, their identities as Americans remain important to them. Now imagine—and this shouldn't be a stretch—that they begin to feel as though they're under attack as Americans, that the prevailing attitude in the country has become anti-American. They respond by staging a rally at which they wave lots of American flags, asserting their pride in who they are and where they've come from. Do the people who're livid over the Mexican flags find any part of this offensive?