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Appeal to authority is only a fallacy when the authority in question is an authority on something else.

E.g. asking an astronomer about global warming.

Appeals to authority are always deductively fallacious; even a legitimate authority speaking on his area of expertise may affirm a falsehood, so no testimony of any authority is guaranteed to be true.

source: http://www.logicalfallacies.info/relevance/appeals/appeal-to...

Though to be fair you just used an appeal to authority to support your statement...

Or when there is no consensus among professionals of the discipline. I.e. dynamic typing vs static typing, or something of that ilk.

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