I believe it should be his right to just simply say my product is not for blind people, and dedicate no resources to servicing this hypothetical user base.
It's very easy to tell others to do something a certain way with a condescending tone from behind your screen if you've got no stakes and don't have to do any of the work involved.
Fortunately, in America we don't believe discrimination is acceptable, and we've codified that principle in the law.
Apparently, in America, its more important to appear to be virtuous than to actually do good.
The law of unintended consequences.
It's perfectly acceptable to not allow someone to rent an apartment because they have a criminal history, or a poor financial or employment history. It's also acceptable for American Express to not issue black cards to people who don't make a million dollars a year.
We have codified some traits that we do not allow discrimination based on, but generally speaking, discrimination is acceptable. Unless you change the general definition of "discrimination" to the legal one, which would seem to make the argument circular (i.e. we have banned discrimination where discrimination is the things we have banned).
You might believe it, but the law apparently says otherwise. It’s ok to disagree with laws while still complying with them, and if you’re so passionate about it... it’s ok to work to change them.
I might believe that my healthcare business shouldn’t have to comply with HIPPA but if I don’t comply I should expect to be sued.
I might believe my online store shouldn’t need to be PCI compliant and that it’s unfair, but if I don’t imply I should expect to pay for it.
Through (imperfect) representative democracy, the public has decided that being sloppy with health information, improperly protecting credit card information, and providing access to your business to disabled people are important enough to enforce via the law. It doesn’t really matter what the business owner’s beliefs are at that point.
Anyone who really thinks it’s so important to deny blind people equal access to their web site is free to run for Congress or find a politician who agrees with them to vote for.
Isn't this exactly what you're doing here, condescendingly name-calling people and dismissing their opinions?