Not in general, but specifically not when I'm trying to persuade an over-tired toddler to eat their lunch?
Toddler had just - literally just - sat down and started eating when DP waltzes in, takes the choccy biccies from the fridge and offers them round. When I say no, DC is eating lunch he says "well you can have one" to which I reply again - no, DC is eating. So he gets huffy, announces "well I can" and then, seeing my face, says, oh, I'm going or we're going to have a row and fucks off. (We have previously had misunderstandings when he interprets my "what are you doing" expression for something much stronger).
I now have had 30mins of tantruming toddler (who now just wants biscuit), and has now fallen asleep having eaten one banana at 11.00 and no fucking lunch. So will be hangry when wakes too.
I don't think iabu in expecting him to not eat biscuits at lunch time - or am I?