What does Deuteronomy 32:21 mean?

They made me jealous with things that aren’t even gods, and made me angry with their worthless idols. So I’ll make them jealous with a people who aren’t really a nation; I’ll make them angry with a foolish people. Deuteronomy 32:21 - Modern Text Bible

(God says he’ll let other, unexpected people provoke Israel, just as Israel provoked him with their idolatry.)