Masochistic personality disorder is the new name for masochism or meanness?

No: There's no "masochistic personality disorder", but self-defeating personality disorder was in the dsm iii (it's not in dsm iv). It describes people exhibiting a pervasive pattern of self-defeating behavior occurring not only in response to abuse. They feel unworthy of being treated well and, as a result, treat themselves poorly and unwittingly encourage others to make them suffer.