そっちこそ

you too

→ 其方
phrase Rare #32,454
you too A casual way to return a remark or emphasis to the other person, often meaning “right back at you” or “you’re the one who…”. The more polite form is そちらこそ.
JA: そっちこそ、元気そうだね。
EN: You too—you look well.

そっちこそ

You too.

— 最強のふたり (2011)

そっちこそどっちが

Right back at you—which one?

— ビッグ・シック ぼくたちの大いなる目ざめ (2017)

そっちこそどうなの

What about you?

— 最強のふたり (2011)

そっちこそ何してたの

What have you been up to?

— ほんとうのピノッキオ (2019)