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Let's try to list a collection of all the most common insults and nicknames for each country (which are used on 4chan of course). I'll start a few off:
>Canada: leaf, canuck
>United States: burger, 56%, yank
>Ireland: potatonigger
>Britain: britbong
>Spain: protomexican
>France/Quebec: frog
>Netherlands: toothpaste
>German: kraut, mohammad
>Hungarian: magyar
>Turkey: roach
>India: poo
>Australia: strayan, emu
>New Zealand: kiwi, sheepfucker, hobbit
>Canada: leaf, canuck
>United States: burger, 56%, yank
>Ireland: potatonigger
>Britain: britbong
>Spain: protomexican
>France/Quebec: frog
>Netherlands: toothpaste
>German: kraut, mohammad
>Hungarian: magyar
>Turkey: roach
>India: poo
>Australia: strayan, emu
>New Zealand: kiwi, sheepfucker, hobbit