COVID-19: Vaccination status polarizes population
People who strongly identify with their COVID vaccine status discriminate more strongly against the respective other group. This is shown by a study conducted by the team led by Luca Henkel, member of the Cluster of Excellence ECONtribute at the University...
It is just correlation, but I bet there will be some causation as well. You are far more likely to go along with the herd if you don't feel socially excluded.