me either - the funny side of learning English

For the most part, Wyatt has the English language nailed. Every single day he will use a word that leaves me perplexed as to how he knows the word. Recently that has been with animals. He'll see a picture and name an animal, and I will think "when did he learn that?" However, he has this funny expression that isn't quite being used correctly. He says "me either" instead of "me too." For example, someone will say "I want to go swimming," and Wyatt will say, "me either!" This is just one of those funny things a mom does not want to forget.