People demonize the wealthy because they see people acting selfishly and it creating, or at least ignoring, the basic injustices of the world. If I had fallen down, would you not ask me if I was okay? Would you not offer to help me up?
Transforming Facebook from a website to a profitable business is a great business accomplishment. Transforming the wealth acquired in such an endeavor into educations, scholarships, and other decency-of-life improvements is simply a great accomplishment.
The economic disasters that impoverish so many are not caused by the rich who've worked to create their wealth but by those who mismanage economies and abuse others to benefit themselves and their friends. These thieves are rich to be sure, but a distinction should be made between the two groups.