It should be socially acceptable to play possum in public, when you hit your limit. If you're curled up in the corner, because you got overstimulated, I'll bring you a blanket and a snack.
This is why people should have offices with doors at their jobs.
Not just so they can be much more productive, without distractions, although it's a repeatedly verified fact.
But the more important reason is that when it's necessary they can curl up in a little ball and hide under their desks .