It is arguable what is called reactive and what is not... however what is measured by sensors and what information does the controller posess is not arguable. 

In feedback control the systems outputs are measuread and if they do not match the desired output (reference) the controled parameter is recalcualted. In steady state mode these differences usually come from disturbances. The controller has a feedback from the systems output which quantifies "how far" is it from the desired state.

In feedforward control the distrubances are measured and the controlled parameter is calculated based on some mathematical (or logical) model. There is no feedback to see if the system is really in the desired state or "how far" is it form the desired state.

So to formulate it with reactive I would say that feedback control is reactive since it reacts to changes in the systems output while feedforward is proactive since it possibly acts before the systems output change.