I do agree that we have posters who challenge one's patience (and sanity, at times) but nothing I have seen mentioned here is anything we might not encounter out in the "real world".
* Some are true trolls and would be rubbing their hands in glee having annoyed someone to the point of a response (such as the OP has stated in this thread).
* Some are prime candidates for the Dunning-Kruger alumni.
* Some are just struggling to get their head around a subject where they don't have the necessary understanding of the fundamentals.
* Some are just lazy and/or not really serious and will throw out a question on a whim and may not come back to it.
.... and other reasons, no doubt.
The other problem is - What is the criteria for members on the blacklist? Who decides?
Now ... DON'T try answering here.
No matter how you set this up, there will be people who will not agree.
My opinion is for each member to make their own assessment and:
So we simply add those time wasters to our ignore list and filter the junk.
That way, EVERYBODY can customise to their own preference. This way, there is no public "shame" list - which
can evoke some intense reaction - which will be a headache for admin/mods.
FYI, I don't have anyone on my profile's ignore list - but I do make a conscious decision to not read some threads ... and if, I do, to refrain from replying. It can be done.