You're right. I'm afraid no rule or logic will help you here. Popular usage demands an objective subject, "It is me vs.
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Junta-104 If there is a preposition !! you must use a Subject pronoun with an Object pronoun !!According to this rule we must say, "It is I against him and her, " and not "It is me against him."
She dance with I : wrong
She dance with me : correct