Our social context refers to the social setting in which we live. In other words, it refers to things like the society around us and the people that we are most in contact with. Our social context does much to influence our worldview.
At the most basic level, we all live in different cultures. A person who lives in a culture like that of Japan will have a very different worldview than someone who lives in the United States (assuming that they have grown up in those cultures and have internalized their values). The American might, for example, be more protective of their individual rights and less inclined to sacrifice for the common good.
Even within a broad, national culture, we can have different social contexts. For example, a person who grows up in a poor household with an uneducated single parent is likely to have a very different worldview than a person who grows up with both their parents in a relatively affluent and educated family. The latter is more likely to have a positive worldview because they have grown up and are living in a social context that has generally been positive for them.
In general, our social context does much to determine how we look at the world. It affects our values and our attitudes, this affecting our worldviews.