The local raptors tend to be "disturbed" when a glider invades their airspace. I guess it's because they fly for a purpose.. eating!
Ravens seem to fly for fun, but the ones I see most of the time will avoid the plane, it's rare they'll let it get close or even fly with it.
The plane is a CR Turbo S, a smallish (56" span) wingeron sloper. Handles well in light to moderate winds..