After asking questions and providing answers here for about 10 years, few days ago I have faced with a very irritating problem.
Currently, the subject of my interest is ImageMagick, a command-line tool for image processing, and the DjVu format. And there appeared a user who began to comment on almost every question I had on these topics on Stack Overflow and Superuser.
The problem is that his comments are totally useless to me. I'm not sure he really understands the technical side (I suppose he does, though not really well), but what I can say for sure is that his sentences are total mess. Words and thoughts are interwinted in the most arbitrary way, missed words, often he doesn't use any punctuation at all, misspelled words here and there AND ALL CAPS FOR WHATEVER REASON, FOR THE GOD OF CHAOS!!!!!1111 And he is very talkative.
I asked him to make his comments more clear, and he replied that this is simply a bad habit, but then he didn't changed his behavior.
I cannot simply flag his comments as spam or something like this, because, well, at some degree they can be considered useful. But the signal/noise ratio is about 1:20.
His comments is even a more serious problem when there appearing another person in comments who began to reply him. There appearing a nearly-useless, but huge discussion, in which one person posts his "spam" comments, whereas another person is trying to understand what the "talkative" guy is trying to say.
What can I do with this?
Feature request: To provide an option to block certain users to comment on your questions.