Least favourite behavior of YouTube these days is the mass of pimple popping and wart removal videos that show up near the top of search results for damn near anything. "Fluke 87v power on options"? Pimple popping. "Generator repair"? Wart removal. And it isn't just one, it's dozens of them, to the point where there might only be one or two relevant results and the rest are basically gore/grossout videos. It's still…
Anyways, for me, I just loathe how the whole site is designed in general. Opening YouTube today on a modern browser is slower than opening it on IE6 back then and the whole site relies on a JavaScript framework even though frontends like Invidious, Piped, and YT2009 (and possibly even more) show that you don't need JavaScript or have to make the entire site rely on it just to view content.