Is it okay to think that "dare" is implied and dropped between "don't you" and "boys" here?
Yes, you can think of "dare" as being implied in this sentence. Technically, the sentence is fine on its own, without "dare." "Don't you" is mentioned, so that is already warning enough. Ex: Don't you (dare) eat my food. Ex: He won't (dare to) cheat on the test.
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