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The contention is "math has only one truth, it's not subjective!", but we are talking about human conventions and notations here, not the abstract nature of the concept of mathematical relations.

In the real world, outside a given classroom that teaches one way, professional mathematicians do not even agree of whether the natural numbers include the number zero not.

Smart people who want to communicate ideas will say "non-negative integers" or "positive integers" to be clear, rather than going on the barricades for the supremacy of a given interpretation. And professional mathematicians just do not write x/yz in their paper. Except when they do.