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A: I can't understand why my parents keep me from buying fast food.
B: Me, too. It's delicious.
Does B's answer sound natural?
In Korea, we usually teach that we should use 'me, neither' in a negative sentence, 'me, too' in a positive sentence. But I am not sure if this is always true.
I think that 'me, too' is a valid response in this particular case, but one of my students said that 'me, too' is grammatically incorrect, so it is unnatural.
Who is right?
You might occasionally hear "me, too" in this situation, but only in casual conversation. Most native English speakers would say "me neither" -- saying "me too" might even suggest you've mis-heard the speaker in some cases, thinking they'd said "I can understand", rather than "I can't understand".
Aside: You will also hear some people say "me either", more commonly in American English.
No, to my understanding, "me too" would be an unusual response to most negative sentences.
We normally answer with a negative construction when we are confirming negative questions, and with a positive construction when we are in confirming positive questions. This can lead to cases that may seem illogical, but are nonetheless considered correct.
For example, let's say that Person A were to ask, "Aren't you coming?" Person B might respond, "No, I am not coming." This is, strictly speaking, a double negative, but is generally considered the correct form. I'm not sure why the language works this way -- it may be a holdover of negative concord, which was normal in Old and Middle English, but uncommon today.
Back to your question, let's say that Person A were to say, "I can't understand it." Person B, if expressing agreement, might respond, "Me neither." If this were a positive expression, Person A might say, "I understand it," to which Person B might respond, "Me too."
I think "Me, neither," would sound more natural than "Me, too," in this situation, although it sounds a bit informal to me. My personal preference would be "Neither can I."
A: I can't understand why my parents keep me from buying fast food.
B: Neither can I. It's delicious.
You might also be interested in this discussion of whether "Me, neither," is incorrect.
A: I can't understand why my parents keep me from buying fast food.
B: Me, too. It's delicious.
In the example (quoted above) both of "Me, neither" and "Me, too" sound natural to me (USA midwest) and both indicate assent with some thought expressed by speaker A.
It is not perfectly clear, however, if that agreement is with the "I can't understand" part – in which case "Me, neither" would be a more-logical response – or with the "my parents keep me from buying" part, in which case B would mean that his or her parents likewise ban buying fast food.
