Why do Tunisian fans whistle their opponents' anthems?

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Before the start of the World Cup Group D match between France and Tunisia on Wednesday, some Tunisian supporters whistled

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during the playing of the French national anthem at the Education City stadium. Before a friendly match between France and Tunisia,

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a former French colony that gained independence in 1956, fans at the Stade de France yelled at "La Marseillaise" in 2008.

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Nicolas Sarkozy, the president of France, was incensed by it and called a meeting of the French Football Federation.

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It was essentially France's final home match against Algeria, Morocco, or Tunisia. Over 700,000 Tunisians reside in France, with roughly 2/3 of them holding dual citizenship.

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Before a friendly game in 2001, Algerian supporters heckled the French national anthem.

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France and the Maghreb team were leading 4-1 with roughly 15 minutes remaining in the game when fans stormed onto the field.

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