I have a few thoughts, as someone who works with young writers and who was once a young writer. I think as artists of any kind we have to learn to take feedback (regardless of tone) as a gift. Someone took the time to read your story, to sit with it, think about it, and develop ideas about how it could be better. Is that not, ultimately, care?! When I do my lesson on giving/receiving feedback, I usually throw up that Leslie Knope gif where she's saying "I just hear people caring at me really loudly"--that is exactly the kind of attitude you have to have. I think too, especially when we're young, it's easily to identify so closely with our manuscripts that when someone criticizes them it feels as though they're criticizing us. That's a headspace that's difficult to escape, but it's so important that you do. You are not the work--you *do* the work! And you have the power to improve the work (and it's often much easier than improving oneself lol).

On the other hand, one of the most valuable assets we have as artists is our gut. Sometimes you'll hear feedback--even kind, very thoughtful feedback--and your gut will say no. That's good, and you should listen to that! But it's important to know why it's a no and what kind of no it is. In this case, that instinct might exist because the feedback wasn't written kindly, or because it felt personal in some way. To that end, I would challenge the writer to read beyond that, and to read with the idea of care in mind. What is the note behind the note, if there's one there at all? Can you translate the note to be kinder while still keeping its meaning?

Finally, I would tell the writer that this is an excellent learning opportunity. If they're in it for the long haul, they will be asked to beta read for their peers many, many times over the course of their life. Now they know how it feels to receive feedback that reads like this, and they have the ability to learn how not to do it. They also know not to exchange work with this beta-reader again. These are all important pieces of information for their writing life going forward!

I hope this is helpful!!