Jealousy

If a given individuals personal assets (wealth, wealth of knowledge, physical appearance, talents, abilities, etc.) disturb you to the point that you are willing (or even bound and determined) to discount, discredit or otherwise dismiss them, then you may be more than worthy of merit yourself. But then again, you might also be quite horridly insecure. After all, healthy competition enriches us all, but unbridled jealousy just brings everybody down. Especially oneself.