[gnicholas]

It appears that the exemption noted by others for businesses with fewer than 15 employees only relates to the obligation to accommodate employees, not customers. [1]

For example, one of the links provided elsewhere is to an EEOC website. The EEOC is the Equal Employment Opportunity Commission, which only relates to employment, not to accommodating customers.

1: https://www.accessibility.com/blog/do-small-businesses-with-...