Why does it matter if there is growing inequality if everyone comes out better? I'm so sick of this line of thought. Bill Gates having $50 Billion dollars does

Why does it matter if there is growing inequality if everyone comes out better? I'm so sick of this line of thought. Bill Gates having $50 Billion dollars does not make any poor person worse off. In fact it is quite to the contrary - the services that Bill Gates makes money off of makes poor people better off by improving the production of goods and therefore lowering the costs for basic necessities.