Well, the chemicals listed in the original comment— fuel and grease— do not have the same acute health impact as the ones they were cited for, and if we’re going to be pedantic about it, I wouldn’t say grout curing accelerator is so common we could assume it would be at most construction sites with heavy equipment. You also don’t need to go any further than your convenience store to buy a bottle of drano, which can cause a lot more damage, a lot more quickly than many of the listed chemicals. It doesn’t matter. The precautions required for production workflows are completely different from home use or small projects. For example: I work in manufacturing. This past Wednesday two of our most experienced workers were applying a caustic glue from a squeeze tube onto a number of parts laid out in a table. One of the workers just happened to be turning his head when there was a small blowout in the crimped end of the other workers tube and it sprayed all over the side of the guy’s head and goggles. It hardened before he could wash it out of his hair, which he had to cut off, revealing a bunch of blisters on his skin where the glue touched. That’s a glue you can buy at Home Depot, but if he wasn’t wearing goggles, he’d have probably had serious eye damage. Two people quickly glueing dozens of things on a table is so much riskier than using that glue yourself for a home project.

These chemicals are being sprayed at high enough pressure to splash them, all day long, in enclosed spaces, in the presence of lots of other people. Even if it was bleach, that would require significant effort to protect the people in that environment from injury. They didn’t do that, the workers are human beings that deserved that, and that shouldn’t be minimized.