While on one of the early TAR Junction rides years back, the group I was in had stopped for a break. A rancher pulled over to visit with us. He was in an F350 with one of those massive steel bumpers. He said he encountered another group where the riders were on his side of the road and they came real close to being bug splatters on the front of his truck. He was not ugly about it at all, but genuinely concerned that we understood the danger and that we spread the word to the rest of the group.
I have ridden with many other riders that like to get up close and hang to the left of me just out of my dust cloud. I usually stop and tell them to either get in front of me or drop way back. I do NOT like to have someone that close to me, regardless of how good they think they are or might actually be. I want the room to maneuver if necessary without having to worry about another rider potentially being in the way. Also, on many occasions, they have had to slam on the brakes and cut back behind me because of oncoming traffic and I don't like startling oncoming traffic. I had one rider doing it, even after being warned about oncoming traffic, and he was almost hit head on.
I was hit head on by an ATV that was on my side of the road and aiming for the ditch didn't save me. He and his buddy were racing and assuming no one else was on the road. I came around a blind corner, hugging the inside shoulder because of past experiences (even earlier that day), and he sent me up and over the ATV. It destroyed the front end of my KLR, but myself and the kid were okay.
I was almost hit head on by a truck on a dirt road on a blind left hand corner. I was all the way out right and he still almost ran me off the road because he was skidding into the corner, essentially out of control. At one point, I had already picked out the branch on a tree I was going to try to grab as the bike was about to go off the edge of the cliff. The guy behind me thinks he actually tagged my soft panniers because I was suddenly pointed the right way after he went past, without stopping to see if we were okay
There are many more examples, but basically it doesn't matter which way the corner goes, I always try to leave as much room as possible for oncoming traffic. The kids in a little Chevy S10 truck that intentionally tried to run me into the ditch barely 10 minutes before the ATV got me on the KLR had a bad ending to their day. They tried to pass on a double yellow at the same time someone else was doing the same. Many hours later when my buddies finally made it back to get me and the KLR, they mentioned that the road had been closed because of the accident. As we went back by on the way to the hotel, I noticed the truck was the same one. It was so mangled I could hardly tell which end was the front or back, but the S10 emblem was easy to spot.
Stay on YOUR side of the road, but be wary nonetheless!