Passive aggressive behaviors are a normal coping mechanism and can even be helpful on occasion. It becomes a disorder when PA behavior is frequent, used in almost every situation, rigid, unchangeable and goes unacknowledged even when confronted (lack of insight).
Many women apologize too much, it's considered "feminine". I guess for some it's a self esteem issue but for myself and the women I know it's mostly just a bad habit. Some simple assertiveness training should do the trick.