I was taught that 'qui' was used when the subject of the verb and 'que' when the object of the verb
You are confusing the interrogative use of qui/que and their use as a relative pronoun.
Qui est-ce? -- Who is it? (interrogative use)Qu'est-ce? -- What is it? (interrogative use)Qui est-ce qui ose me déranger? -- Who is it that (who) dares to disturb me?Qui est-ce que tu as rencontré hier? -- Who is it that (whom) you ran into yesterday?
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