I can't speak for all RV tailwheel pilots but for me, I say that ground looping an RV is something a pilot would have to work at.
My experience with traditional tailwheel aircraft compared to the RV9 has shown me it behaves very very nicely slowing down from a wheel landing.
Where other aircraft like the champs, birddogs, cubs, cessna 120/140s might spin at the least amount of rudder in-attention or sharp crosswind, the RV continues to track nicely where it was going. Prior to completing and flying my RV9 I worried a great deal about the dreaded ground loop. All the worrying was misplaced, I've had no problems with ground loops in the RV.
So my advice to anyone building or looking to buy an RV9 or RV7 etc.; they should get some time in one before worrying too much, or at least visit and talk to a tailwheel RV pilot/owner.