Is you a predicate noun

No, the Word 'you' is a pronoun (not a noun).

The pronoun 'you' is the second person, personal pronoun; a Word that takes the place of the noun (name) for the person spoken to.

A predicate is the verb and all of the Words that follow it that are related to that verb. A predicate can include a noun or a pronoun.

Examples:

I love you. (the complete predicate is 'love you'; the simple predicate is the verb 'love')

I made you some brownies. (the complete predicate is 'made you some brownies'; the simple predicate is the verb 'made'; the noun 'brownies is the direct object of the verb; the pronoun 'you' is the indirect object of the verb)