You can use an app like voyager that lets you block specific subs. I have the porn ones blocked but you can just block all the meme subs that annoy you.

On the app I just hold down on the name of the sub and it lets me block it.

Any community you aren’t subbed to should have a block button in the sidebar. Block the sources until you stop seeing the things you don’t want.

Or just ignore them and keep scrolling.