As you might have guessed I (strongly suspect) have BPD.
My husband has aspergers. He's a wonderful person however some of his behaviours can be very difficult to live with indeed. He can have meltdowns and shut downs. He stonewalls (not intentionally, it's a defence mechanism)
If I have an episode then I'm clearly being manipulative and/or abusive.
If my husband has one, he can't help it he's autistic.
Yet there is no stigma attached to autism. Autism isn't something people are made to feel ashamed of(which im thankful for as i have an ASD son). Telling somebody you have autism isn't going to result in them making a snap decision that you're probably abusive.
Likewise bipolar, bipolar is a perfectly acceptable disorder to have (not for the sufferer, obviously, I'm sure it's horrid to live with) but for society. You'll likely be met with sympathy if you have bipolar, depression, panic attacks.
Society is even moving away from the stigmatisation of schizophrenia now which is brilliant.
But not borderline, borderlines = scumbags (in many peoples minds)