Is it wrong that if a customer complains and asks for a manager, I give them a coworker instead?
Why do you give the customer a coworker instead of a manager?
I do it for kicks even though it is a bad career move
You are misleading the customer by allowing them to think that they are speaking to a manager. You need to be honest with the customers because they have a right to speak to a manager if they have a complaint. You could lose your job with this behavior.
I don't care. I'm going to enjoy this.
Deceiving a customer that wants to speak with a manager is wrong and can lead to you having problems at work.