A userscript that hides all answers and comments from certain users on StackOverflow. Currently, the user ids of the blocked users must be edited directly in the script's source code.

SE_hide_user_posts.user.js

// ==UserScript==
// @name         StackExchange hide user posts
// @description  Hides all comments and answers from blocked users
// @version      1.3.8
// @author       Paul Pinterits
// @include      /^https?://(meta\.)?(stackoverflow|serverfault|superuser|(.*\.)?stackexchange)\.com/questions(/tagged/.*)?$/?/
// @namespace    Aran-Fey
// @require      https://github.com/Aran-Fey/userscript-lib/raw/ca6999d1bac2494421b70286f74d7a9a9ba636e7/userscript_lib.js
// @require      https://github.com/Aran-Fey/SE-userscript-lib/raw/bf77f40b25d7fa88a6c3f474390c858446154ec2/SE_userscript_lib.js
// @grant        none
// @updateURL    https://gist.github.com/Aran-Fey/bfa61a33157a5da475d110c4400eb6f2/raw/SE_hide_user_posts.user.js
// @downloadURL  https://gist.github.com/Aran-Fey/bfa61a33157a5da475d110c4400eb6f2/raw/SE_hide_user_posts.user.js
// ==/UserScript==


// add user ids to this array to block people
// for example, `var blocked_user_ids = [1222951];` would hide all of my posts (:
var blocked_user_ids = [];


blocked_user_ids = blocked_user_ids.map(id => id+"");

function hide_if_blocked(post){
    if (blocked_user_ids.includes(post.author.id))
        post.hide();
}

page.transform_answers(hide_if_blocked, Rerun.AFTER_CHANGE);
page.transform_comments(hide_if_blocked, Rerun.AFTER_CHANGE);