This (edited) version (the original version is in the question) hides your and other users' user data on all StackExchange sites. (I added the *.stackexchange.com/) It also blocks your own reputation and badges (which you can see at your profile page anyway). (I removed the last line.)

Special notes: You can easily add more websites to this list by editing. Use tampermonkey to use userscripts in Chrome.

// ==UserScript==
// @name           Hide other users reputation
// @namespace      CrazyJugglerDrummer
// @description    hides all users reputations except yours in site header
// @include        http://*.stackoverflow.com/*
// @include        http://stackoverflow.com/*
// @include        http://*.stackexchange.com/*
// @include        http://superuser.com/*
// @include        http://serverfault.com/*
// @include        http://stackapps.com/*
 
// ==/UserScript==
function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}
addGlobalStyle("span.reputation-score, span.badge1, span.badge2, span.badge3, span.badgecount, div.accept-answer-link, div.user-gravatar32 { display: none; }"); //hides undesired user info

This (edited) version (the original version is in the question) hides your and other users' user data on all StackExchange sites. (I added the *.stackexchange.com/) It also blocks your own reputation and badges (which you can see at your profile page anyway). (I removed the last line.)

Special notes: You can easily add more websites to this list by editing. Use tampermonkey to use userscripts in Chrome.

// ==UserScript==
// @name           Hide you and other users' reputation
// @namespace      Raindrop11
// @description    On all the sites below
// @include        http://*.stackexchange.com/*
// @include        http://stackoverflow.com/*
// @include        http://stackapps.com/*
// @include        http://mathoverflow.net/*
// @include        http://superuser.com/*
// @include        http://serverfault.com/*
// @include        http://meta.stackoverflow.com/*
// ==/UserScript==
function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}
addGlobalStyle("span.reputation-score, span.badge1, span.badge2, span.badge3, span.badgecount, div.accept-answer-link, div.user-gravatar32 { display: none; }"); //hides undesired user info