It’s very hard not to take feedback personally
one thing I read decades ago now, which helped me, was that you don’t have to take responsisiblty for the feedback and opinions behind it (not unless there’s a stash of data showing you’ve significant performance issues) , but you do need to take accountability for fixing it.
in other words you don’t have to agreee with what’s said. But focus instead on the so-what’s that need to happen to change that persons (one giving feedback) perceptions.
it also helps massively when you realise that people giving feedback can be asked to support and provide help in fixing that issue. Frankly if they refuse they look like complete wassocks in saying you need to do this, and then refusing to help fix it- and worse if they’re your actual manager
go in with a view you’ll probably apply for something else, but maybe it might help with self awareness that some wretched people view a particualrly aspect of your performance/ behaviour in a certain way
also pin them down to specific examples - what was situation, what was your role they expected of you, what did they perceive you did/did not do, and what was result to business. If they can’t do that you can merely shrug it off with a “they’re a wassock making personal criticism “
for instance I had a bullying boss..one of comments he made was about “people don’t like tone of your voice”…so I ask which people (he was evasive and therefore had no clear evidence), I asked what is was about tone of voice - and pushed and pushed him to be specific saying I needed to know to fix it, until he eventually said it was high pitched or sometimes nasally …so I said I’d write down in my performance document that I needed a voice coach (aka Margaret thatcher) and that I expected him to ensure HR would get funding for it….well off course he backtracked…he was just bullying and making personal attacks. But I did write it down, and refused to take it out and it went on to provide evidence for his bullying. along with numerous other examples of his personal critiques of my character.
you never know, Boss may come up with some sincere and insightful comments that you haven’t realised, and whatever you decide to do that’ll be useful learning for future.
I realise you’re devastated…but I think with changing outlook to taking accountability to change his perception whilst not having to taking it responsisiblty for his opinion, might help you go into meeting with curiousity and some degreee of emotional resilience needed.
I think not attending is not a good idea. If you can’t move jobs immediately they’ll see it as no longer interested in development. You are, you’ve just had a lock in teeth.