This is why the Americans with Disabilities Act is such a horrible and horrendously vile piece of legislation. Is is so broad and open to interpretation that is it deliberately used as a cudgel that creates a "tyranny of the few".
You might well feel this scenario would be hyperbolic and utterly ridiculous, but I could see the ADA being used as a cudgel by a plaintiff in a lawsuit to mandate the use of peanut butter "sniffers" that would be mandatory in any business or facility.
Check out these two graphs about the Federal Register, the comprehensive summary of all statutes, rules, and regulations in this country:
Total pages in the Federal Register by Year:
Number of significant rules added to the Federal Register by President:
We are drowning in rules and regulations, never mind the burden that this places on industry and makes us non-competitive with many foreign industries. The bright spot is someone like Trump who has dramatically reduced this trend, but he is a once in a lifetime President in this respect, we won't see his likes again.
I know you think this kind of legislation would never happen, but I can guarantee you that it will. And that is why I believe the sole responsibility for protecting this lies with the parents of a child and an individual. I regret if someone has to live in a bubble due to this, I really, honestly do. But if that is how it must be, I would prefer that over impinging on millions of people and their livelihoods to protect them.