Surely this is discrimination?
Yes it is and if they don't back down they need taking to court.
Masks do a bit of good in conjunction with all the other measures, that's all. Masks are not a magic bullet and it's entirely disproportionate to exclude people who are unable to wear one from essential activities like buying groceries or using public transport 'for the foreseeable future' (Matt Hancock).
The legislation on face coverings makes very clear that some people are exempt and it explicitly mentions those who are unable to wear one because of a disability as defined in the Equality Act.
It's very clear that the government intends the face covering exemptions to be a way of providing legally mandated reasonable adjustments for disabled people and avoiding unlawful indirect discrimination.
Most of the government's rationale for mandatory face coverings was to do with 'consumer confidence', not public health. They thought if they made us all wear face coverings then we'd feel safer to go back out and spend money in shops, get back on unsafely crowded public transport, stop WFH and go back to the office, picking up a Pret on the way.
www.gov.uk/government/speeches/face-coverings-to-be-mandatory-in-shops-and-supermarkets-from-24-july
But every business is obliged by law to provide reasonable adjustments for disabled people and indirect discrimination is only lawful if it's a propotionate means of achieving a legitimate aim. Supporting the economy is a legitimate aim but if that's the aim, rather than public health, then what is proportionate?
Costco have shot themselves in the foot by saying a shield is OK because, as I'm sure we all know by now, a shield is completely ineffective in terms of public health. So they can only be refusing access to a load of people with disabilities, and (overwhelmingly) women who are recovering from sexual violence, in the hope of increasing their profits.
This all looks massively disproportionate to me and I would be happy to chip in to any legal fund against Costco or any other business that has a similar brain fart.
Meanwhile, face coverings do make a bit of difference so you really should wear one if you can.