If you visit HN on mobile you can use the app Hacki - it allows you to block users. It's more a mute than a block, you still see the username and the attribute

If you visit HN on mobile you can use the app Hacki - it allows you to block users. It's more a mute than a block, you still see the username and the attribute "blocked" but you don't have to read the comments. No, I'm not the creator of Hacki, I found it in a search.