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Is there a difference between "can't you" and "don't you"? As in:

You just can't behave properly, can't you?

vs.

You just can't behave properly, don't you?

I don't understand their difference (if there is).

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Both sentences are wrong. The second is more wrong.

You just can't behave properly, can't you?

This should be

You just can't behave properly, can you?

The second makes no sense at all.

The first sentence, as I've rewritten it, would come across as a criticism and the question at the end would be rhetorical.

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