One interesting aspect ij academic literature about trust, it is highly reverse correlated with diversity. No matter the grouping and size, the more diverse, the less trust within the group.
Nit: it's not objective diversity that matters, but the perception of diversity. The distinction is important because I've been in many rooms that my father would have considered diverse, but I am not even remotely phased by it. Our definition of "diversity" looks nothing like the definition of "diversity" for a tribe of 20 hunter gatherers who never left the 600 verdant acres that they called home.
You can alter your own reality by convincing yourself that someone is or is not like yourself ("diverse"), especially by consuming specific types of media - perhaps media that is produced with intention of you distrusting certain people.
Again, it's an important distinction to draw, lest you be drawn in to certain misanthropic theories based on flimsy "proof".
One interesting aspect ij academic literature about trust, it is highly reverse correlated with diversity. No matter the grouping and size, the more diverse, the less trust within the group.