I suggest you peruse the Americans with Disabilities Act sometime.
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Show me the part of the ADA that exempts someone from policies meant to protect health and safety? Quick tip, there isn’t such a portion. Reasonable accommodation goes a long long way, but doesn’t chop that line at all.
But you’re welcome to talk to the lawyers for Disney who’ve effortlessly won dozens of ADA lawsuits challenging health and safety rules. My favorites are those challenging the use of restraints while on a ride. And trust me, Disney isn’t going to be backing down on the mask rules.