You could go crazy with the definition game... technically a survivalist is one of those bomb shelter freaks who has a years worth of c-rations in their cellar and a 1970 copy of the Boy Scouts of America handbook.
True survival is more about adaptability than over-preparation. Anyone can stockpile food, medical supplies, water, a weeks worth of backpacking supplies, 6 feet of rope, etc... a true "survivalist" could make due with a minimal amount of supplies in any situation... but I wouldn't call that a survivalist... i'd call that a man. or in rarer cases a woman.