"An adult with an Autism Spectrum Disorder may 'seem' to have no problems and you may dismiss them as 'doing just fine', but please remember that these adults appear this way due to years of hard work to develop successful 'coping mechanisms'. These coping mechanisms are NOT NATURAL. They require a lot of mental energy to implement. They work best in ideal situations. Any stress including fatigue, illness emotional upsets, and surprises will interfere requiring even MORE effort to camouflage their internal reactions.
Simply put - it is EXHAUSTING! Please understand.
They 'have' worked and still are working hard to fit into your world.