So, at present there's only two people completely blocked from having their comments shown on my YouTube channel as their comments are occasionally highly toxic. One of those two people recently left a comment that got one upvote. ...that means they upvoted it themselves. :P
Right, but I can still read the comments they try to leave when I go to Creator Studio > Community. I sent feedback once before to suggest a feature like this, I can always do so again. :B