That is definitely very bizarre. I would probably have laughed outright and said, yes, I love to feed my inner child. Keeps me young so I don't turn into a dried up old prune like you! (ok, I may or may not have said that last part - depends on just how much of a jerk I thought the person was).

I pack those kinds of things in my lunch (and my husband's lunch) all the time. Hubby actually often grabs my pink thermos lunch box to use and his co-workers teased him about putting a hello kitty sticker on it. So I found one!!!  We don't care about what other's think.

Life is too short to go around picking such silly fights.