I know this guy who completely dogg'd his ex out for this girl with money. He would hand the girl the phone to talk trash to his ex girlfriend. he showed messages his ex was sending him. he completely embarrassed his ex girlfriend for this girl. For a whole year she used him for sex and a place to stay. she even had a guy on the side.
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This particular guy is a D-bag, obviously.
But your actual question makes no sense. "Guys do not disrespect their ex for the wrong reasons" in general. Asking a question this general makes it impossible to say anything in response both because you have loaded the question with implicit meanings, and because you do not really ask anything but try to state an overly general opinion in the shape of a question.1