The web UI doesn't have a way to do that right now (hopefully an update will add that in the future) but some mobile and progressive web apps do have this option. I'm trying out wefwef on my Android phone and you can click the vertical ... menu on a post and choose the hide option, or (thanks to a recent update) swipe to the left. I suggest trying out some of the apps in development and seeing if there's one that's useful.