Have you ever tried to mute a hashtag?
There's a helpful dropdown when you click on it, and you'd think selecting "mute #hashtag" from the dropdown would mute that hashtag in one click. Ha, no.
Ok, does it take you to the "add new filter" form with the hashtag pre-populated in the "keyword or phrase" box? Also no.
It takes you to the filters index where you can manually click the "add new filter" button and type in what you wanted to filter yourself.