Oof. I feel this one. I spent most of my childhood in - what we consider - a small city (10k people). My school class was like 20 kids with a few different ethnic backgrounds. Then we moved to a mountain town where the elevation (in meters) was a multiple of the population count, my class (including the neighboring villages) was 4 and there was exactly one family who didn't look like they were at least 20 generations Swiss.

My dad is a very outgoing person, passionate volunteer firemen (most towns here have their fire department on a volunteer basis), contributed to the town council, was pretty religious (BIG up there, when there was a mass during the day then all the classes from school attended) - but they literally were just happy to take his work but not give anything back. The protestant priest from the neighboring village checked in on our family (protestant) and him (catholic) more often than our "our" priest. My mom befriended another "immigrant" family who had been there for 10-20 years and basically had NO connections in town. My father made 1 good friend and 1 good acquaintance at work.

For us kids it was a lot easier. The other kids were welcoming and friendly and even the adults were somewhat accomodating to us. But I was approaching adulthood and started to experience this myself. Town tradition was that for christmas the oldest kids in primary school would dress up as the 3 magi and lead the younger ones around town to sing christmas songs. And they would also participate in the christmas mass. They were in a pickle that year as from a class of 4, half were protestant heathens. I was still expected to stand in the front of the church as ornament but when the edible paper was distributed I was rudely shoved away.