لَا النافية للجنس denies the predicate of every member of the class named by its indefinite noun. In لَا رَجُلَ قَائِمٌ, the meaning is not about one particular man; it denies that any man is standing.
Sentence
Scope of negation
Natural meaning
لَا رَجُلَ قَائِمٌ
the class of men
No man is standing
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Negating an Entire Class with لَا
لَا النافية للجنس denies the predicate of every member of the class named by its indefinite noun. In لَا رَجُلَ قَائِمٌ, the meaning is not about one particular man; it denies that any man is standing.
Sentence
Scope of negation
Natural meaning
لَا رَجُلَ قَائِمٌ
the class of men
No man is standing