Capitalism oppresses people with under-employment and low-wages. Socialism, on the other hand, restricts those who have been placed in position of trust from using their positions to oppress others. Or another way of putting it – Socialism oppresses the capitalist's ability to oppress the workforce.
If you work and want fair wages, then you are a socialist.
When a capitalist tries to argue that socialism subsidizes the cost of living of citizens that are unable to work, point out the fact that – The lives of wealthy capitalists are actually subsidized by the hard work and sweat of low-wage workers.
Socialist policies grew America's middle-class; but, our current capitalist policies are destroying the Middle-class. Each era of increased capitalism led to a financial crisis. Every time socialism is increased, an era of historic economic prosperity begins.
Caveat: There are some inherent pitfalls trying to offer simple, bite sized definitions of capitalism, socialism, communism and fascism.
For a point of reference, the United States is a Constitutional Democratic Republic that has long embraced both capitalism (free markets) and socialism (public schools and universities, and public works – parks, roads and highways, sewer and water, dams, harbors, as well as social welfare, such as worker’s comp, unemployment insurance, social security etc.).