"When Christians spend huge blocks of their time with NON-Christians, and very little time with fellow Christians, something is badly wrong." -Quote a man made on Twitter
I found this offensive. As a spiritual person I tend to be drawn to/draw in people who are spiritual -but not necessarily Christian. And I wouldn't discriminate against someone or refuse to hangout with someone just because they weren't Christian.
Hanging around people of the same faith is something you do for yourself for support of others and/or dependency on similarity and/or fear or those who are different.
Hanging out with people of different faiths is something you do for the world -to show that differences don;t have to divide people and that people can get along and share and grow with one another in the face of any diversity.