you don’t read every article when visiting the website either, do you? so you’re already doing the sorting.

no one’s forcing you to read all of them, either set a short expiry time for the feed so the unread ones get deleted after a day or week or whatever, or mark them as read so that they disappear and move on. some readers allow you to set filters to e.g. ignore articles with certain keywords in the headlines, if you’re feeling a bit extra.