I experienced similar behavior when I moved from a smaller city in US to Bay area. The small city at a macro level was far more homogenous when compared to Bay

I experienced similar behavior when I moved from a smaller city in US to Bay area. The small city at a macro level was far more homogenous when compared to Bay area. However, I made friends with folks from a diverse group. I found them to be open to meeting new people. But, when I moved to Bay area, I realized that people are already part of some clusters (based on their home country, state or school) and are less inclined to create new friendships; particularly with someone not fitting into their cluster criteria.