DD is 2.3 and goes to nursery. She is going through a phase of telling her teachers 'no' and refusing to do things (normal toddler stuff!)
Me and DH have tried to talk to her about this and ended up saying "You don't tell grown-ups no", which in hindsight doesn't feel quite right either 
How do you explain to a 2yo when it is/ isn't ok to say no?