Is it possible to block people from writing in your thread?

Example : I write something here and one some people would come and only flame and say nonsense things and make a mess in the thread until it get closed.
So let say like Mr X come here and say BS and then, I don`t want him any more to come and write in any of my future thread .
Am I able to put him on a list to prevent him from access to my thread ?
( like for the buddies )

This will prevent a great amount of useless flame in the forum .

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