Yes. Bring on the rational disagreement and opposition to a subject or post. No problem there. If a correction or clarity can be brought through exposing an error, I welcome it. I seek to be corrected if I am wrong.
But some people are douches, pretending they are "intellectually" superior and resort to baseless insults and name calling instead of focusing on the actual subject at hand. Some people seem to prefer that, to dismiss a post without actually addressing a single point made, and brush it off with nonsensical mockery.
Here is an example from someone many on Steemit view as a "smart" person who is well liked by many:
"please P.M the drug combinations you are doing to write these"
"Now you are flagging my comments @krnel?
Started getting sour I see.
You are just full of it. I seriously believe you need mental supervision."
That's not disagreeing in any valid way, that's just being an asshole. They, and many people, could clearly learn a lot from your post, through I doubt they would care to. They seem to think they are "right" for ignoring a subject and trying ti ignorantly dismiss it or belittle the person who wrote it, simply because they "don't like it". It's childish immature behavior.
Take care. Peace.