A human being laughing at an Ocampan's life expectancy is no different than a Vulcan laughing () at a human's life expectancy.
Vulcans must have such pity thinking about the brief spasm that is the human condition and must make some sort of dog-year-fatasticly-ignorant-and-telepathically-void-(souless)-ike equation to justify humanity not throwing the towel in.
We'll we've seen Humans life to be almost 150 and Vulcans just over 200 Earth Years. For all we know 150 Vulcan Years could be about 200 Earth years.