When did "sentimental" become a pejorative barb? I do not at...

When did "sentimental" become a pejorative barb? I do not at all share the notion that a piece of music, or a poem, or a film that bypasses the brain and aims straight for the heart . . . should automatically be heaped with scorn. I think it is symptomatic of a sad and dangerous impoverishment of spirit.