Glad you're having a great time on Steemit! You are absolutely right, people here are awesome.
YouTube is so much bigger, and that brings a lot of lowlifes and trolls onto the platform. There's not really a proper moderation system on place to go through all the comments, also, that would be a lot of work.
On Steemit, there are several real people who make sure that such people are kicked off the platform and that is great!
But yeah, don't leave YouTube just for that, ignoring is the best. Peace :)
I said it earlier today in reply to a comment from someone else: Hopefully the moderators and the community will be able to keep those type of people away from this platform but that can be hard if the platform blows up overnight for instance, for whatever reason.
Yeah, once the userbase increases, it will certainly be hard to keep them out. But, hopefully by then, they will have a solid system in place!