You can absolutely get methanol from a bad batch of a fermented beverage. It's typically only a problem for distilled spirits because methanol's evaporation point is lower than ethanol, so you end up accidentally enriching your distillate; in non-distilled beverages there's enough ethanol to keep the methanol away from your liver enzymes.
Going blind from methanol poisoning really gives the visual hallucinations some nice oomph.
That doesn't happen from fermenting. This might make botulism though
You can absolutely get methanol from a bad batch of a fermented beverage. It's typically only a problem for distilled spirits because methanol's evaporation point is lower than ethanol, so you end up accidentally enriching your distillate; in non-distilled beverages there's enough ethanol to keep the methanol away from your liver enzymes.