Others have weighed in here and summed it up pretty well I think. During my search for a DBT provider or some kind of treatment over the last 5 months, I have learned that to be a DBT provider requires specialized training.
I've heard horror stories about ignorant psychiatric professionals, but I was relatively lucky. The therapist I had from age 15 - 19 didn't turn his back on me when I was finally diagnosed in 2011. He continued seeing me until my place came up on the DBT waiting list. He was helpful, but at a certain point he was unable to help me progress any further due to a lack of experience with PD's on his part.
I generally find that people don't know what BPD is, more than that they have a preconceived negative notions. I agree with the others that the disorder may not define a person, but at least for me personally, I think it will always be a part of me.
I'm able to hide the demons from most I come into contact with (even those who would say they know me pretty well), especially now that I'm sober. I didn't realize there was a name for this concept until just a minute ago, but it's been my primary coping method since cleaning up my act. Many would call me nice, intelligent, and normal. Little do they know.
There seems to be a clear lack of public education reguarding BPD, and in my area treatment is impossible to get if you don't have Medicade, or are able to shell out hundreds of dollars out of pocket persession. I was lucky to have finally found a therapist a few weeks ago who will see me this week. Sure he's 30 miles away, but.. he takes my insurance so I can aford the co-pays, and he seems legit. I'm more than happy to take the help with both hands and run with it at any cost. I don't care so much about the stigma as much as I'm fed up with who I am.
Best of luck.