I really fear such a thing.
Reading this, I wonder, is DBT really worth it?
I sound like a neurotic: I'm scared of therapy. I doubt anyone can understand these problems and not doing therapy at least gives me some hope. But maybe understanding them is not required. I wouldn't know.
Someone basically saying that it's useless to continue would be catastrophic. Especially if they don't actually say it. I mean, thinking you can't handle the truth. That's bad.
I hope you find a way to continue with and benefit from therapy or applying what you've learned yourself.