Is this something? or Nothing?

Hello Internet. I have a question to ask you. While I am frequently not serious and make light of many, many things, this is for real and I need your advice.

If your child came home from school and said that another child, a girl, age 4 said to her:

"...I hate myself. I wish I was a boy."

and your child, who is only five but very perceptive, said that the child who made the above statement seemed to not be joking when she said it, would you feel concerned enough to let the child's teacher know?

I don't want to butt in or make a big thing out of nothing because I hate when people do that but if you watch any TV at all, you know that children with gender identity issues frequently suffer a great deal until they reach a point where they are able to do something about it. In fact, 60 Minutes recently did a piece discussing, sex, gender preferences etc. and how it is, in fact, discernible in young children way before they themselves understand what they are feeling. That having been said, I'm not sure if this is even the case or what but if it was MY child, I'd want to know if she was saying she hated herself. Gender issues aside, it pains me to think of a child feeling that way.

Incidentally, this is not someone that my daughter knows well. She is in another class and they see each other on the playground usually but my daughter thought it was unusual enough to tell me about it. Once again, maybe it's nothing. Or maybe it isn't.

So...you can see that I am concerned. But what should I do?

UPDATE: I talked to the teacher and she confided in me that she had some concerns of her own and she will be addressing them, which totally makes me feel better. But looking at my stats today, I'm surprised to see how many people were here that didn't have anything to say about this. Anyway, I will probably delete this later as the matter has been resolved, AFIC. I'm just leaving it up so anyone who cares can read the update.