My boss talks crap about my other coworker and told me not to look up to him as a role model. Why would she go out of her way to tell me that?

She’s constantly complaining about mistakes he makes and errors, how he rushes into things and she’s not happy with how he does things. Today she sent me a list of people to talk to for help instead of him. Is this my fault or is she more upset with him?
My boss talks crap about my other coworker and told me not to look up to him as a role model. Why would she go out of her way to tell me that?
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