Relational Art?

Bourriaud defines Relational Art as not necisarily interactive art but art which considers the whole of human relations and their social context. Although i find this a particularly broad term...
All art must be interactive in some form as it must have an audience for it to exist as art. Also all art relates to or in some way depends on society, as art would not exist without society. So to say that Relational Art considers social context seems unnecessary.?