I wasn't born yesterday - You tell someone you're not a brainless idiot who needs help

You tell someone you're not a brainless idiot who needs help to do simple things.

'I wasn't born yesterday' he said, because his dad tried to teach him how to walk.

'I wasn't born yesterday' she said, because her friend tried to teach her how to be a person.

'I wasn't born yesterday' he said, because the guy tried to explain how to exist.