As humans we make mistakes and it applies to EVERYBODY. Given this fact, lot of us still make fun of those who commit mistakes. The other day when 3 of us were playing table tennis, I found myself laughing loud when my fellow friend played a horrible shot (well, the ball went perpendicular to the table due to his swing of his racket) while the 3rd friend did not laugh at all.
Nothing unruly happened after this but just then it clicked me – Its a great habit to not to laugh at others mistakes. This is an easy way to stand out from the crowd (which usually latches on to anything that’s laugh-worthy, no matter who gets hurt) and this will easily win you lots of friends.