Do you ever talk to your friend with a mean comment?

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I was totally regret on what I said to my friend yesterday with a mean comment. Would it be okay I just don't want to reveal what I said to her yesterday? I just felt so sorry now when I come to think of it. I felt like that I hurt her feeling a bit, although she didn't reveal it. I should take back what I said to her, and I shouldn't do it again. I was just angered at her at the moment. Now, I learn it as a lesson. Have you ever done it to your friends?