#5: Sarcasm Tends To See The Negative, Not The Positive
Sarcasm secretly feeds on itself. The more you notice those things worth a zinger—foibles, faults, flaws—in the people around you, the more negative things you find to insult rather than finding positive things to applaud. Sarcasm rarely or never seeks out the positive. Eventually, it will be difficult to find the good in people. Negativity breeds negativity.