It's interesting how many of the people railing on corporations and the "1 percent" have no problem denying opportunities to people less fortunate than Americans.
I'm an American. I care about the Americans I see every day walking to work in Philadelphia. Income inequality in the US hurts them. Income inequality between the US and other countries helps them. Very simple.
It's only hypocritical under the presumption that people care about income inequality simply on its own. But by and large, people care about income inequality for what it does to their communities, their political processes, etc. That rationale for caring about income inequality is entirely consistent with caring about it in the U.S. but not between the U.S. and other countries.