Here's why:
* Definition: A sneer is a facial expression of scorn, contempt, or disdain. It is often accompanied by a curled lip and a look of superiority.
* Usage: When someone sneers, they are expressing negativity towards another person or thing.
* Examples:
* "He sneered at her offer of help."
* "The bully sneered at the smaller child."
While "sneer" itself doesn't directly describe something good or bad, its definition and usage inherently tie it to negative emotions and behavior.