When you're a "bad boy," other people are just means to an end—that end always being pleasing yourself. And when others refuse to continue being an object of your pleasure, "bad boys" show just how bad they can be by being physically, mentally, and/or emotionally abusive.
Typically when we think 'image' we think 'visual' but our self-image consists, not only of how we look but also of how we sound. Communication is a integral part of what it means to be human so the way we sound when we speak is indivisible from our self-image.
What I find particularly compelling about the 7 deadly sins is that they are all based on emotions. In fact, I think that instead of calling them 'sins', they'd be better identified as 'nasty' (undesirable) feelings that have the potential to develop into harmful actions.
