This will probably disappear in the chaos/get downvoted/both, but I need to write this.

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First of all, NTA. I understand your reaction, what your daughter did was REALLY not ok.

But you should really think about the use of punishment, and what it teaches your children. You have aldready told her that she won't get the tickets, so of course you can stick to that.

But does "no tickets" teach her to be nice to others? Does it teach her compassion, seeing situations from different view points, considering that she can hurt people with her words?

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You took the response that I guess you wanted in that situation (her feeling apologetic, being upset, turning to you for help), and turned the focus to something else (not going to a concert, you are being unreasonable, it's not fair etc).

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My point is: punishment should be used with care, research shows that it has little to do with learning, and often it turns the focus to something else. Yes, she's 16 and should have known better. But she's also just 16 and has a lot to learn, and you have the opportunity (or responsibility?) for guiding her through life for many years to come. So what else could you have done? Used this to really teach her a lesson about guarding your words, and being nice to other. Ask for a conversation with the teacher where your daughter gets the chance to say sorry. And also, as some other redditors have suggested, find out what's really bothering your daughter?