S.T.
i'm sorry, my dear, but it's time for you to deal with your childhood demons and take responsibility for your own psyche.
your stepdaughter is quite right. being unable to 'tolerate' the snickering and hinting at having a nervous breakdown because of it is way, way over the top for a mature adult.
you handle this by learning something about personal shielding and learning how to ignore the minor irritations of life. it honestly sounds as if you're way overdue for some good counseling to help you define your boundaries and triage the important focuses of your life.
khairete
S.