If you ask me you should always ride about 1-1/2 to 2 feet from the white line on the right side of the road. This means that you will not get squeezed off the road as any car passing you has to go around you or over you. If you ride closr to the edge of the road, many cars just try to squeeze between you and oncoming traffic without slowing down or using any caution what-so-ever. This gets you knocked into a ditch or hit by a rear view mirror.

Also if a driver is angry and yells something obscene or getures in such a manner, just smile and wave. They don't know how to respond to that. if you respond with nastiness you have to remeber they have a far heavier vehicle and could have a gun. You would lose to either of those.

my 2 cents
(from a few thousand miles on the roads)