I've noticed that guys will say stuff like "my ex was psycho" "my ex was (insert horrific quality here) etc... For me, regardless of whether or not they were actually like that, it just seems disrespectful. I couldn't do that to someone, even if they hurt me really bad.
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Most of my guy friends I know, actually do that. The reason is simple. They have a lot of bad personal qualities (I can see them), but rather than say they have a problem with X or Y they need to get better at, it is much easier to blame everything on the ex-. If she's crazy, well, then there is no helping that.
Drawing attention away from themselves and deflecting bad characteristics are a way they can put their best foot forward in the new relationship. Of course, a clever girl will know whats up.1