I don't like the negative effect it has on my classroom. The inventor of those little tiny school-style cards ought to be confined to a room full of sugar-laden fourth graders with their ADHD meds wearing off. There's no educational reason to "celebrate," but if I dared refuse, my car would be egged, my house stoned, my teaching reputation dragged through the mud in the neighborhood...
Yes, I feel very negative about Valentine's Day in school.