I posted this question about two month ago. Shortly after this, I got a moderator private message. It says:
We've noticed that you have a pattern of engaging in lengthy discussions in comments, frequently consisting of responses involving multiple, back-to-back posts. Extensive comment threads tend to be a distraction for other readers.
In view of precedents on math.stackexchange.com, we are immediately suspending your account for a few days. We hope that you will take this time to reflect on the way you decide to interact with the MathOverflow community.
I believe that a MSE user's suspension should not be a reason for his suspension in MO. As for the lengthy discussions in comments, I think they talk about the comments in my question.
You can see that the discussion was triggered by a moderator's request that I post link to MSE meta questions which are relevant to my MSE account suspension.