'Too easy' in current Australian and Gen Z usage just means 'no problem' or 'sure thing' — it is a relaxed agreement, like saying 'easy' or 'no worries'. If you ask your teen to pick up bread on the way home and they reply 'too easy', they are agreeing willingly, not boasting that the task is beneath them. The tone is friendly and cooperative, not sarcastic in this sense. Listen for the rhythm: a quick, light 'too easy' is positive; a drawn-out, flat 'too easy' could be sarcastic in the literal sense. Almost always harmless.