It's often noted that toddlers say 'no' a lot because that's what's constantly said to them. Toddlers are just mirroring what they're receiving. Then adults flip out, because they can't cope with being treated the way they treat toddlers.
Far less acknowledged is the way youth are constantly told 'you should'. They come to believe that's the normal way middle aged and elderly people interact, because that's the only way older people interact with them: projecting judgement and instruction. Then adults flip out because they can't stand being spoken to the way they speak to teens.