In both types of fermentation (lactic acid and ethanol), the first step is glycolysis, in which glucose is oxidized, and donates its electrons to NAD+ to form NADH. Pyruvate is reduced in fermentation. At any rate, pyruvate is not oxidized in either type of fermentation
Humans perform lactic acid fermentation that converts pyruvate to lactic acid. Bacteria and yeast can perform ethanol fermentation that converts pyruvate to ethanol.