I sympathize with the barista here, but mindset that customers need to cover 10 to 20% of his income is symptom of decades of brainwashing of employees and customers alike. In this case NPR is part of this brainwashing. I will not tip someone for doing their job. I will only tip when I feel it is needed based on the service provided.
How about employers pay a decent wage - one where tipping isn’t necessary, we move to universal healthcare and we stop tipping altogether?