The Social Security Administration (SSA) is responsible for administering two federal entitlement programs established under the Social Security Act that provide income support to individuals with severe, long-term disabilities: Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI). SSDI is a work-related social insurance program authorized under Title II of the act that provides monthly cash benefits to nonelderly disabled workers and their eligible dependents, provided the workers accrued a sufficient number of earnings credits during their careers in jobs subject to Social Security taxes. In contrast, SSI is a need-based public assistance program authorized under Title XVI of the act that provides monthly cash payments to aged, blind, or disabled individuals (including blind or disabled children) who have limited assets and little or no Social Security or other income. In 2017, SSDI and SSI combined paid an estimated $199 billion in federally administered benefits to 14.5 million qualified disabled individuals and 1.5 million non-disabled dependents of disabled workers. SSDI is part of the federal Old-Age, Survivors, and Disability Insurance (OASDI) program, commonly known as Social Security.

Social Security = OASDI

SSI is part of social security.

So saying::

That’s Social Security. You don’t pay into SSI

Is like saying:

That’s a rectangle. You don’t pay into squares.

We pay into OASDI if we work. Some of that is for retirement stuff, but part of what we pay funds the other parts you don't need to pay into to get benefits from.

Like I said tho, it makes sense when you realize 80 years ago OASDInwas meant to be universal healthcare and a retirement fund. Unfortunately "moderate" Dems and Republicans united to block FDR against the will of voters. And for almost a century things have been tweaked, but they still say we can't have universal healthcare.

So OASDI is just "the bare minimum to avoid riots".