Ever since my BPDbf found out he has BPD, he constantly accuses me of being the one with BPD.
I let him think what he wants (I used to fight it, not so much anymore, it really has no use).
If I raise my voice because he's upstairs, I am "raging", and so on. For every term that is used among the BPD world, he can put it on me... He just doesn't see how bad it is when he's doing it.
So maybe when he's "raging" to me, in his head, he's only raising his voice?
Good luck to you my friend, don't let it get under your skin

Whenever you need a sanity check, we're here ^^