Employee commitment is the cornerstone of organizational success, yet workplace incivility—particularly ostracism—can severely undermine this foundation. Ostracism, or the deliberate social exclusion of individuals within an organization, is a pervasive but frequently overlooked issue that erodes trust, diminishes engagement, and fosters a hostile work environment. When employees experience ostracism, they often suffer from emotional exhaustion, a state of extreme psychological distress that weakens their attachment to their work and their employer. Over time, these consequences lead to diminished affective commitment, resulting in disengaged employees, lower productivity, and compromised organizational sustainability. This chapter investigates the destructive cycle of ostracism, emotional exhaustion, and reduced affective commitment, drawing on empirical research to illustrate the profound impact of social exclusion in professional settings. Based on a survey conducted with employees—171 valid responses out of 250 administered—data were collected using pre-established measurement scales across two waves to minimize bias. The findings confirm that ostracism significantly heightens emotional exhaustion, which, in turn, drives a sharp decline in affective commitment. Furthermore, emotional exhaustion was found to be a key mediator in the relationship between ostracism and organizational commitment, amplifying the effects of exclusion beyond initial interpersonal interactions.