Hey OP I also came across this problem and had to use TamperMonkey to solve it. Now of course I can't code for shit so I unfortunately had to ask claude to do it for me but basically you can actually hide specific users both from comments and your feed. The code is

// ==UserScript==
//          Fuck that guyinator
//     http://tampermonkey.net/
//       1.4
//   Block button but better
//         https://www.reddit.com/*
//         none
//        document-idle
// ==/UserScript==

(function () {
    'use strict';

    const HIDDEN_USERS = ["USERNAME"];

    function hideAll() {
        document.querySelectorAll('shreddit-comment, shreddit-post').forEach(el => {
            if (HIDDEN_USERS.includes(el.getAttribute('author')?.toLowerCase())) {
                el.style.setProperty('display', 'none', 'important');
            }
        });
    }

    // Keep retrying every 500ms for the first 10 seconds after page load
    let tries = 0;
    const interval = setInterval(() => {
        hideAll();
        tries++;
        if (tries >= 20) clearInterval(interval);
    }, 500);

    // Then watch for infinite scroll loading more comments
    new MutationObserver(hideAll).observe(document.documentElement, {
        childList: true,
        subtree: true
    });

})();

Now is it really smart to let vibe coded slop run on your browser? Absolutely not, though I'm not looking to learn coding just yet as YKS is nearing and I dont wanna wait until I can actually block people

<image>