I have never blocked a comment on this site that wasn’t straight-up spam. This should not be construed as a promise that I never will; it’s my site, and I reserve the right to block anything for any reason. So far, I just haven’t seen the need.
Not that I haven’t had some pushback in the comments, but I generally prefer to let the criticism stand. Sometimes I answer it. Sometimes the arguments are so inane that I think they have the opposite of their intended effect. And sometimes they’re so gloriously bad that I want to make sure my readers see them. This one falls into the third category.