For the sake of transparency I will say that I am absolutely anti-rack except in cases of very temporary use such as some hatchlings or for quarantine situations. However, I don't make anti-rack comments on videos as I somehow doubt that my comments are going to change anyone's mind one way or another. The same is true of others reading comments on your videos: pretty much nobody cares either way about what commenters do or don't say. People watch videos for the content, not for the comments.
I do have multiple friends who are content creators on YouTube and all I can say is that unless the comments fall under the category of being reportable because they are actual threats, you have a couple of choices: just ignore them, or turn comments off.