People don't try to make life tougher than it is for no reason, their lives are probably speckeled with failure in certain things, failure leads to wanting to be better, and if that weren't bad enough, when they do meet someone who is better than they are in that area our old friend envy pays a visit and then things get ugly. I have no proof of this but I beleive that 50% of bullying is because of envy. In other cases where people may make fun of the way you walk or talk that is usually because they have anger issues and are annoyed by little things like this, but it is all trased back to the seven sins my friend.

Sloth:
Greed:
Lust:
Gluttony::scream:
Anger:
Pride:
Envy: