I can remove any posts that anyone makes in a thread that I start, don't know if that's a moderator only thing but check your thread and see if you can. The remove post button will be in the top right-hand corner of the post you want to remove from your thread.

And there is an option in your profile to ignore a persons post but it does not prevent them from posting it and it only makes that persons post invisible to you, everyone else will still see that users post which may put you at a disadvantage in a post they make against you. I never have put anyone on the list since I would no longer see what they are saying in response to any post I submit.

I have an ignore button in my brain for A-holes.

Personal attacks are not permitted and can be moderated.