As someone who's also posted quite a bit on sites like YouTube over the years, I wouldn't say the amount of negative comments have been that overwhelming. They certainly exist, but they've always been a minority of the comments on my own videos.

But it's definitely dependent on the topic you're posting videos about, the audience you're aiming at and I guess how unlucky you are when it comes to attracting trolls and other troublemakers.

You definitely do need a thick skin though.