Well the airplane, being an inanimate object, isn't able to care about anything. The point though was that with wind comes turbulence, which does make flying harder. Even smooth wind has a certain challenge about it, since the task of flying is to maintain a course relative to the ground. The RC pilot's task is easier on calm days since the plane just does as it's told. Learning to fly precisely on windy days is another skill to learn, and a lot of guys have a tough time with it.