How many times have you watched arguments unfold in the comments sections of posts on social media? There's always someone who is just plain nasty and when they're called out on it they'll say something about it being a public platform and they can express their opinion if they want. While this doesn't justify them being a complete butthole, they do have a point and that point is that if you're discussing things publicly you're going to have to deal with people who disagree with you and not everyone is reasonable about it.
When I decided to start sharing on social media I was aware that there might be people who didn't agree with what I was sharing. I could have just joined private groups to share with other like minded people and I do that too. However, I also wanted to spread the word that you can grow food and keep livestock in your home garden without having lots of land. I've had some great feedback from people who have been inspired to do similar things because of what I've shared, but there are also those who will tell me I shouldn't be doing what I'm doing. On some platforms I can delete nasty comments, but on others I can't, so I find ignoring them the best approach if they have nothing constructive to offer.
Steemit is very much a public platform and you have no control over other's comments. Only they can choose to edit or remove them. So if you're sensitive to criticism then maybe not share anything controversial. On the other hand if you enjoy verbal battles and slanging matches, post away and stir the pot!
I guess the thing to decide is are you wanting to share a message or just share with like minded people. If it's the latter, then join a private group where any argumentative people can be kicked out if they're upsetting others. If you want to share a message, then an uncensored platform like Steemit is a great place to do so and most of the time, even if others disagree with what you're saying, they are reasonable enough to have a civil discussion. You'll just need to develop a way to deal with the aggressive ones.