From what I remember from pop-psychology books, people create their in-groups on the spot when the situation allows them to also identify an out-group.

This was the classical experiment I remember: https://en.wikipedia.org/wiki/Realistic_conflict_theory#Robb....

People who don’t have an ingroup are called psychopaths. I know at least one person who (claims to have) reasoned themselves into something resembling utilitarianism from that starting point but that’s a minority end point to not having a capacity for group loyalty.

White liberals have strongly negative in-group bias: https://www.tabletmag.com/wp-content/uploads/2019/06/AA2.jpg

I can't gather any information from that chart alone. It lacks all context, which is important.