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Re: Sherlock finally admits to hating being called "Freak."
Here are two stories (the second is a rewrite after a rather spectacular blowout) that kind of fit your description, though it's John who finally has enough.
Freak (http://archiveofourown.org/works/732322?view_full_work=true)
Freak (remix): http://archiveofourown.org/works/751002?view_full_work=true