Someone who looks down upon pretty much anyone from any nation that did not take part in
the colonial imperialism of the 1700-1800s. This essentially includes every large European nation, along with the
United States. However this can include whatever nation is among the most prestigious, domestically peaceful, and powerful with a significant deal of
international militaristic influence.
Grandpa: "Billy, have you heard tell of those savages in
the middle east? Bloody awful lot, they are. If only they had submit to our colonial rule for a short while longer, we could have shown them the rule of law and perhaps some manners. They probably wouldn't be beheading good Briti..."
Billy's Friend: "What's he
going on about now?"
Billy: "Don't mind grandpa, he's a bit of a sneering
imperialist."