Sometimes it's useful to define something by what it's not. In this case, I'm going to explore the concept of self love by looking at the various ways that a lack of self love can manifest behaviorally.
When someone has a healthy degree of self love, it is evident on a behavioral level. Inner feelings, whether conscious or unconscious, elicit outer expression. Whether that outward expression is negative or positive depends upon the inner feelings that triggered the behavior.
Therefore, the following behaviors can be evidence of a lack of self love. Ironically, these common behaviors are often done in an effort to bolster feelings of self love. Sadly, the efforts usually lead to further self denigration and a perpetuating cycle of self defeating behavior.