Vulcans are portrayed as suppressing their emotion, not being emotionless. In humans, suppression of emotion is generally viewed dimly. It's associated with behaviors like "bottling up your anger until you finally snap", which seems to be a theme some star trek portrayals of Vulcans have explored as well. In our society people are generally encouraged to talk about how they feel and to express their emotions openly.

I think there is a certain mindset (seemingly more prevalent among engineers...) that admires Vulcans for their suppression of emotion. But I think that's a minority mindset that most people consider aberrant.