An interesting question for me since I have lived in the home of a non-SDA for decades--my husband.  That is where I learned to socialize with "them." Oh, he goes to his church now on LLBN-TV  while I attend a local church. I have worked for the church organization 20 years but don't live in a "ghetto." Many of our friends arem't church members but some are Christian and I see no reason to change them. I don't have difficulty in talking to them because we have like values. We don't discuss doctrine unless they ask about it which has happened on occasion.  I think most of them are kinder, nicer, and more helpful than I am (so is my husband).  
  Now how do you witness to neighbors who seem "perfect?" They have perfect, beautiful, intelligent, talented adult children. They are good-looking, talented, rich, friendly and live in a mansion. (I don't, thus hesitant about inviting them over for dinner even though they have had us for many Thanksgivings in their palatial home.)