Not really, that's actually a myth. You can't accidentally make methanol (it's the "bad" alcohol that makes you blind/kills you) from fermenting.
However, the finished homemade product might not taste good though.
So what should I think of what I heard : people drink bad vodka in Russia and it is worse for their health than the vodka you would buy in a store
Sometimes illegal producers add methanol or ethylene glycol to the booze just to make more profit (since that is cheaper).
Therefore you should only buy stuff you know comes from serious vendors. However, if you make your own homemade stuff, that's not dangerous.
Wine won't contain enough methanol to damage you (unless you're a full-retard drunk). The issue comes in distilling since, like ethanol, methanol has a boiling point significantly below water's boiling point (side-note: the boiling points given for ethanol, methanol, and water need to be used with a grain of salt, since the boiling point will change given the liquids are not divided up in pure forms and thus will not exactly "conform" to the boiling points for the pure substances). This is why you want to dump the alcohol as it comes up to temperature (if you're only doing one pass, you'll want to dump out a bit more at the beginning). Even though it's probably the highest-proof alcohol you'll distill in the pass, it's largely methanol -- no good. Anyone with enough knowledge to set up a still should know this. The reason why we talk about methanol not as a theoretical problem but a real problem is because the
US government blinded and murdered thousands by requiring methanol as a pseudo-denaturuant in alcohol production as an attempt to enforce prohibition.
n 1926, the federal government increased the amount of methanol, a poisonous alcohol-based substance, required in industrial alcohols, which people at the time used to make bootleg liquor. Faced with the ongoing failure of Prohibition, the increase was intended to discourage people from drinking.
"It gives a greater warning to the drinker that he is getting hold of something that he should leave alone," a government chemist told the New York Times at the time.
A good example of supposedly good intention of the government that is harming the people; they always have a good excuse to take your freedom, haven't they?