When I was a JW at the age of 9 my parents had a mixed race couple coming to live with us, he was West African she was Sicilian. He had won a scholarship in architecture at the local university and around where my parents live most people own their own home, esp. during the 80's finding an apartment to rent was really hard. They lived with us for 7 months, I never seen a black man up and close until then, and was great to know about a different culture. I got to eat foods that he brought over from his country like plantain that fascinated me greatly.
I was blessed to have been born in a family that isn't racist with or without the JW teachings, despite coming from a country who IMO is highly racist and struggles to this day in dealing with other nationalities/cultures and skin tone, hell they are even racist between their own people depending if you're from north or south. At one point my mom wanted me to become missionary or something like that to go find me a brother of another race LOL.
I think some people are most comfortable with people of their own culture and race and others are comfortable with whomever they get on with. I also feel that many people, this is in general not just amongst JW give far too much importance to what their family want for them,what they'll think, how they'll react. The first serious relationship I had even if I had already faded, was with a guy who was perfect for my parents but not for me. Taking aside the fact he wasn't JW, he had otherwise all the things my mom told me to look for in a husband, the virtues, the characteristics in his personality etc etc. I fell in love with him because he was the "right guy to take home" rather than the right guy for me.
Resulting in 4 years of hell. So once I finally got rid of him I learnt from the negative experience, to not to care about my family but to care who was right for me.