I understand, being forced to look at AIDS makes me not want to come here. If you have a userscript plugin like Violentmonkey, you can use this (it works in overboard too):

// ==UserScript==
// @name        heyuri
// @namespace   filterstuff
// @include     *.heyuri.net/*
// @version     1
// @grant       none
// @run-at      document-end
// ==/UserScript==

{
	// Get board name from the current URL!
	let board = document.location.pathname.substring(1, document.location.pathname.indexOf("/",1));
	
	// Get filters from the browser's local storage!
	let filters = localStorage.getItem("filters");
	try {
		filters = JSON.parse(filters);
	} catch (e) {}
	
	// Fix the variable if it's invalid!
	if (!filters || typeof filters !== "object") filters = {};
	
	// Make sure the filters object has an array for this board!
	if (!filters[board]) filters[board] = [];
	
	function hide (event) {
		// If didn't click with the left mouse button, don't do anything!
		if (event.button !== 0) return;
		// Prevent the click from doing anything else by accident!
		event.stopPropagation();
		// Add this post number into the filters!
		let num = Number(this.dataset.num);
		filters[board].push(num);
		localStorage.setItem("filters", JSON.stringify(filters));
		// Hide the post!
		let post = this.parentNode.parentNode;
		if (post.classList.contains("op")) {
			post.parentNode.style.display = "none";
		}
		else {
			post.style.display = "none";
		}
	}
	
	// Loop through threads on the page!
	let posts = document.getElementsByClassName("post");
	for (let post of posts) {
		// Get post number from the ID!
		let num = Number(post.id.replace(/[^0-9]/g,''));
		// Hide this post if it was filtered in the past!
		if (filters[board].includes(num)) {
			// If this post is OP, hide the entire thread!
			if (post.classList.contains("op")) {
				post.parentNode.style.display = "none";
			}
			else {
				post.style.display = "none";
			}
		}
		// Add button for hiding the post!
		let button = document.createElement("a");
		button.innerHTML = "[Hide]";
		button.style.cursor = "pointer";
		button.dataset.num = num;
		button.addEventListener("click", hide);
		post.getElementsByClassName("postinfo")[0].append(button);
	}
}