"Unconscious or hidden beliefs – attitudes and biases beyond our regular perceptions of ourselves and others – underlie a great deal of our patterns of behaviour about diversity." 2008 Diversity Best Practices: Proven Strategies for Addressing Unconscious Bias in the workplace.
To learn more about your own biases:
Undertake the Harvard Implicit Association Test (IAT), the most effective online tool to gain greater awareness about one's own biases, preferences and beliefs. https://implicit.harvard.edu/implicit/
Seek out feedback from your team and peers about whether your personal preferences and beliefs inadvertently hinder diversity.
Make a positive effort to learn more about the experiences of those not in your 'in-group'.