I know my game.It's clear that you enjoy being argumentative and provocative, but that does not make you any more correct than repeating a falsehood in an echo chamber, so I will likely drop off after this post.
You seem obsessed with one edge of a metal, cup-shaped protective device. If that scares you so much, consider the plastic / composite versions. Or metatarsal guards.
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Your grandfather's anecdote, and the opinion of a mis-informed, former employer don't stack up well to researched engineering standards in dozens of countries, and hundreds of millions (billions?) of protected feet in workplaces.
I wont wear them.
If you are getting upset you could just duck out. It seems to be a trend that you get upset in discussions when people dont agree with you.