• websites that fuck with scrolling in any way
• autoplaying videos
• sticky videos
• developer focused websites without darkmode
• popups when you move your cursor out of the window of the website
• unprompted popups
• links that break middle mouse button clicks for opening in a new tab
• burger menus on an otherwise rather empty website, or pure content site on desktop
• gigantic text, where 2 rows take up my entire screen, especially bad on larger monitors
• that relatively new sign in with google popup on the top right on some websites
• low defaults for amount per page selectors in product lists or similar, the default should depend on how many products fit on my screen, not some arbitrary value
• slow loading content, or other requests that take more than ~100ms. With a modern internet connection this shouldn't happen
• (not cookie banners in general, but) overly large cookie banners, also the legitimate interest toggle which, most of the time, is enabled by default (you might have interest in my data, but its definitely not legitimate); or cookie banners which block you from reading the site before clicking anything, (I know this is related to legal stuff it is not legally necessary to make invasive cookie banners)

Other people have already mentioned some of these as well