I don't understand why people are unnecessarily mean. Like did you really have to make that comment? You could have kept your mouth shut and left that person not feeling bad about themselves. What do you gain for making someone else feel like shit? Nothing. Maybe a fleeting moment of power, but that's gone as soon as it comes so whats the point? What did you gain from laughing at that person? It may not look like they're hurt but they probably feel bad from that small thing you just did. There is enough unhappiness in the world without you adding to it.