The physical, politically correct world has consequences for having dissenting opinions. This is slowly changing with the death of liberalism and my generation being the most anti-social-justice of any, but the state is still run by leftist hippies from the 1960s-1980s.
The internet is not like that. People can be honest on here, and while the government surveills everything, they are in no position to punish the silent majority who hate political correctness. They can censor public broadcasters, education institutions and even public speech, but internet speech is simply too great in volume and too unpredictable to censor.
So it's not that the internet promotes "hateful" speech, but rather than the world is still quite politically correct, where honesty is punished. Just consider the fact that 17% of young women in my generation consider themselves feminist. The number has never been higher than 50%. However, every broadcaster, every public figure, every politician has to pretend to be a feminist, or at least not publicly come out as an anti-feminist. Feminists are, in my experience, one of the most unpopular political groups around, yet enjoy blanket political support. Immigration is a similar issue.
The world has changed, and the internet has played a big part in letting people realise that their un-PC viewpoints are not only not weird and not reprehensible, but normal, popular and widespread. The reason you think the internet promotes "horrible men" is because you live in a bubble where no man can say anything to you without your highly-strung response being treated with utmost sympathy while he risks vilification or punishment.
Pop your bubble sweetie. Reality isn't as nice as the clouds, but only by accepting the world as it really is will you grow and find happiness.