Was at a gathering, a close friend with bpd said the following during an argument. Honestly, it wasn't even that bad. I just don't think she was happy at that moment...  

"if you want to insult me, go ahead. Call me a bitch."

I have seen this happen before and I am not sure what it means. Is this like a way to self-destruct? To ruin the relationship by devolving to pure insults?