Well always try to show that they are more telented then a women.They tell the things widout adequate knowledge and facts.This gives women an idea that you are untolerable and a flirt.
Talking about ex's and in particular about old girlfriends in a bad way. One day she may be your ex and she doesn't want a preview of how you may talk about her to her replacement.
They opens to women very soon.They become an open book.So it makes women to read their mentality level well.Well being a men you should always keep a women guessing.