Are you tagged in a thread that you don't want to take part in any more?

You can mute just the conversation itself, no one will know you've done this:

-Log in through website or a third party app, go to one of your posts in the thread, click on ⋯ and "Mute conversation".

-If you haven't posted in the thread, go to a post where you were tagged, then ⋯ and "Mute conversation".

-If you change your mind, do same thing but select "Unmute conversation".

The official app doesn't have this yet.