If you want to stop a broadcaster from popping up in your views, go to the broadcaster’s profile by clicking on their profile picture, then select the OPTIONS menu at the top right corner and click BLOCK. Refresh your views and they will be removed from all views (including live). If you ever want to give them a second chance you can always go into the MAIN MENU -> FOLLOWING -> BLOCK and swipe left for iOS (hold down for Android) to unblock them.