Bad is stronger than good.
Bad is more attention-getting than good. Humans pay more attention to and give more weight to negative rather than positive experiences or other kinds of information.
Bad emotions, bad parents, and bad feedback have more impact than good ones, and bad information is processed more thoroughly than good. The self is more motivated to avoid bad self-definitions than to pursue good ones. Bad impressions and bad stereotypes are quicker to form and more resistant to disconfirmation than good ones.
