When I was a young kid in Brooklyn, we were the only non-Jewish family on the block. They treated me like I was one of their own, with the cheek pinches and backslaps by the grandparents just like their own grandkids. I even earned a little doing shabbas goy work when someone forgot to buy milk on Saturday morning, back when you could get a quart of milk with a quarter and have nickel for gum or a candy bar left over.
Then as I got older when I heard a lot of anti-Semitic comments from others including some from my own family I always thought that was completely nuts and still can't understand it.
To me Jews are like canaries in the social coal mine: when they start getting hard time, it's a bad sign.