My girlfriend is mean to me and told me to grow up. Isn't it wrong?

She is very sarcastic and mean to me. I told her the things she told me were hurtful and offensive she told me she was only joking and I was not mature enough to understand. Now, I cannot tell her that even that was hurtful. Isn't she rude?

My girlfriend is mean to me and told me to grow up. Isn't it wrong?
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