#Mastodon tag features
You can follow a tag, but not a boolean combination of tags. No way to follow # DC and not # Metro(rail)
You can mute a single person or an entire tag, but not a person who won't stop flooding a tag with bad content. (No way to mute @johndoe and #foobar )
Most clients don't allow news feed filter to just tweets by mutuals vs tweets of a tag.