Grimace & act like it hasn't affected you:
I'm teaching (a short contract position) at a small school that works with "the unmanage-ables" of the school system. It is challenging!
Today one child said something particularly unpleasant to me. Then a second later he asked: "Do teachers' have feelings, Olga?" They may not have many social skills, but they are EXPERTS in pushing buttons!
The teachers who work there permanently are saints!