I understand the need to spin some sort of 'hatred for the wealthy,' but that is just a desperate attempt to change the topic and avoid the real issues.
The real issue is that a certain socialistic (or Marxist) view holds that large amounts of wealth should be confiscated (or prevented from happening in the first place) for the perceived "good" of society.
Items 2 and 3 from Marx's own 10 elements of communist principles:
2) - A heavy progressive or graduated income tax.
3) - Abolition of all right of inheritance.
Whether you call such "hatred" of the very rich or not is pretty much up to your individual taste - but certainly the elements of trying to eliminate or greatly diminish the higher levels of wealth is clearly visible.