Helicopters handle turbulence signicantly better than do fixed-wing. When an airplane wing going 100 knots meets a gust of wind, that gust has plenty of time to act on the wing. My helicopter rotor, on the other hand, is presenting a new wing to the gust 394 times per minute.
Are helicopters affected by turbulence? Sure. Do people get sick in helicopters? Sure. In rough air, which one would I rather be in? Helicopter, hands down. Helicopters can still fly on days when they won't even pull the airplanes out of the hangar.