I don't think the top one is correct, and "only slightly" is too vague to argue with. The last one is kind of misleading. If your net worth is positive, you have more wealth than the bottom half of the world's population, for example. And those kinds of misleading presentations should immediately put people on alert.
The fundamental tension for someone like Bernie is that 1) Things keep getting better for the poor (both globally and in America). To stay non-partisan (though there is a clear difference between U.S. parties), this is a very long-term trend (post Civil War here) that only deviates a little based on differences in policy at any given time. And 2) Bernie wants the issue of inequality to be treated as an urgent problem. 2 doesn't *necessarily* require lying about 1, but it gives him a major incentive. A third issue is that while liberals think that improving living standards for the poor means a combination of trying to increase overall growth and making sure that it is distributed as broadly as possible, Bernie and his section of the left is more ambivalent about the first part of that (that is, they think we basically have enough now and just need to distribute it better).