I totally understand why you are hesitating, but the great thing about this platform is that hatred comments and spam are not welcomed here.
So if people will try to comment negative stuff - they will be flagged and their comment will be hidden. Their reputation will be really low and they wont earn anything from they stay.
Share Steemit with your audience when ever you are ready - but I felt like telling you that we, the community, wont allow hatred comments.
And btw, I have a question for you.
How did you find out about Steemit?
*upvoted for visibility
That's exactly what I was going to say. Youtube can flag, but flagging can be controversial in that it being used for obscene and violent comments only, whereas here you can just downvote because you don't like it, and if other do the same...poof comment gone