あの取引先の人、上から目線だよねって英語でなんて言うの?
営業先の担当がいつも偉そうにしていて困っています。
回答
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That person from that company looks down on everyone
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That person from that company is arrogant
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That person from that company is condescending
上から目線=looks down on (us/you/everyone etc.)、arrogant、condescending