Does that "most" mean 60% of people, or 90%? Unsolicited advice only annoys me if it's long-winded and preventing me from doing something else. Also, I don't

Does that "most" mean 60% of people, or 90%? Unsolicited advice only annoys me if it's long-winded and preventing me from doing something else. Also, I don't know what "validation" is in this context. Oxford English Dictionary doesn't seem to adequately cover psychobabble (though it does at least have the word "psychobabble").