Neither vs either in a negative statement [duplicate]

Solution 1:

The negation is already present in "can't", so "either" is used.

A variation with "neither" would be:

• A: You can't say a word to anyone.
• B: Neither can you [say a word to anyone].

Solution 2:

The reason it is "either" is because your ending word is talking about the action, rather than a pair of people. Therefore, you should have "either" in that scenario. Additionally, I don't believe you're allowed to end a sentence with "neither", either. =)

Either: "You aren't allowed to A and you aren't allowed to B either."

Neither: "Neither person A nor person B are allowed to talk to anyone."

Extra source: Either/Neither Examples