I think that would work better actually, if they can't understand reason, fight chuddery with chuddery, call her a filthy immigrant with the tipical ignorance of an american, and the same urge to ruin everything even for the "good" people living in the First World(TM); "you won the cold war by default and instead of conquering the world you managed to end up a shithole of a country, so much you had to escape here and freeload honest Canadians. Remain silent"

Or just ignore them and chill, eventually they'll see the light.