Are "men at work" signs sexist?

Today I was triggered by a "caution men at work sign". For a start why do you never see a person at work sign or a woman at work sign? Then there's the question of why should I be the one to be cautious? Safety is their responsibility or can men not be trusted to injure passers by?

We need a sign that says "people of various genders working carefully as possible but please be cautious just in case one of them has a little whoopsie"
Are men at work signs sexist?
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Are "men at work" signs sexist?
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