Since it's a negative sentence, wouldn't "neither" be correct to use here instead of "either?"

Native speaker’s answer
Rebecca
Good guess! You have to be careful with the use of double negatives in a sentence. "Didn't" is used here, so using "neither" would make it a double negative, which is grammatically incorrect. Remember that a double negative actually makes it a positive (i.e. I didn't neither = I did). To make this correct, you could say: Ex: They didn't give me anything neither. -> incorrect because it is a double negative Ex: A: I didn't get anything. B: Neither did I. -> correct because it only uses one negative