そんなことはよけいなお世話だ。

such (about the actions of the listener, or about ideas expressed or understood by the listener); like that; that sort of

thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

too many; too much; excessive; superfluous; superabundant; extra; spare; surplus; unnecessary; needless; uncalled-for; otiose; abundantly; excessively; needlessly; all the more

help; aid; assistance

be; is; indicates past or completed action; indicates light imperative