“What if it is the only choice they have in their community?”
From my experience, every store with this policy also offers the reasonable accommodation of doing the shopping for the person while they wait outside without a mask.
Which is why these lawsuits are most likely going to get tossed quickly.
ADA allows accommodations. But standing outside the facility will not be included.
That would be like the store saying to someone in a wheelchair that their isles are too small and someone will shop for them as they wait outside.
Or a hotel not installing the lifts for guest and instead instituting a policy of an employee standing over the guest with a water hose to simulate swimming.