Customer 54 (idiot)

Customer came into the store for a repair, no problem whats wrong with the phone. He says the screen is not touch sensitive. Ok well lets look at it, an hour goes by he comes back and our lead technician talks to him and it turns out the screen has been replaced with an off brand screen so its no longer covered under warranty or insurance. The customer freaks out, not sure why hes still arguing this because its common knowledge if you replace a part that was in warranty or covered under insurance that it will no longer be covered because well.... its not the part that was insured or in warranty.So after arguing with our lead technician for 5 min on this our tech is pretty much done with this guy so he says OK well we will send it out to apple and when they decline it we can pass it on them since you don't understand simple concepts. I don't understand the illogical thought of some of these people. Let me know what you think in the comment below.