I’m the idiot?

[Fuctup]

I was telling my stepdad today that I need to get my car retuned as it doesn’t like to run smoothly when I have the aircon running so being the know it all he is tells me I should just adjust the idle screw on the fuel rail and when I try telling him it doesn’t work like that ”anymore” you need to connect a computer to the car he just gets shitty says whatever turns his head and refuses to talk to me like I’m the idiot that doesn’t have a clue about cars. P.s I should have known better than to talk cars with him in the first place, to him whenever my mums 2015 Mazda MX5 needs a service he’ll change the oil and oil filter and call it done. Great service dad!