Regressive doesn’t mean you pay less as you get richer. Regressive means you pay a smaller portion of your income as you earn more (the opposite of a progressive tax like income). Higher income people spend less and less of a portion of their income on consumable products and services (and more on sheltered investments or property), so spend a smaller fraction of their income on sales tax. That is the definition of a regressive tax.

*even though it is a regressive tax, it still should be applied fairly or eliminated all together. No more exemptions for silicon valley.