BPD is rarely talked about in my region, specially because "borderline" translates into a weird word in my native tongue. Also psychiatry is more flawed in the third world.

I just tell people I'm either bipolar or that I have something like bipolar disorder without the mania and 24/7 instead of it being episodic. Sometimes I also have to explain psychosis right there to avoid trouble. It usually works most of the time. People get very understanding most of the time; keep in mind I'm a guy, it's not like I have beta orbiters trying to be nice.