Blocking people on the boards

Is there a way to mute / block / whatever people on the boards? I feel like this should be a thing, but if there is a way, I have not found it.

There is this one person (SA&S regulars will know who I am talking about) who comments on most posts with unrelated comments about the same thing over and over again. I mean, that's fine for him, but I don't want to see his spam. I have reported his comments and posts several times because, in my opinion, this is spam.

However, Riot does not think it's harmful or worth a ban. Which, again, is fine, because it's their decision. It's just that I don't want to read his bullshit anymore.