It offends my sense of fairness to see the disparity between the very small number of very, very rich and the very large number of very, very poor.
It offends my sense of "people should enjoy freedom" to see so, so many people who are very much not free because of the economic system that offers them no way out of poverty.
(And I don't believe that poor people are all choosing poverty. I've been poor, and no one wakes up to that and says "this is what I choose.")
And it offends my sense of language when people use phrases like "build Microsoft" as though it was a doghouse that someone assembled in an afternoon and sold for the cost of materials plus $50 profit. Gates no more "built" microsoft than George Washington built America, or whatever. Lots of people were involved, and even if they were compensated well, maybe they weren't compensated fairly. Profits being the unpaid wages of the working class and all...