Social rejection is painful and can lead to violence
https://www.sciencedaily.com/releases/2018/06/180614212911.htm
"Social rejection can have a number of negative outcomes both for the rejected person's own health and well-being, as well as their interpersonal relationships," said lead author Alexandra Martelli, a doctoral candidate in the Department of Psychology in the College of Humanities and Sciences. "Therefore it is critical that researchers find adaptive ways at responding to social rejection, and mindfulness may be one effective emotion regulation strategy."
The study, "When Less is More: Mindfulness Predicts Adaptive Affective Responding to Rejection via Reduced Prefrontal Recruitment," will be published in the journal Social Cognitive and Affective Neuroscience.