I have read your posts very carefully. Something you said, "I hope I have the courage to see through with dignity." especially sat with me for a while. In my head I keep repeating it, because that's what it is isn't it?
When something happens that brings us shame and embarrassment, no matter how much we rationalize, no matter how many books we read on self-esteem, at the end of the day we have to put those teachings that innate knowledge we have, that inner strength to action and use the courage to get through the event with dignity.
And you know...I think you will. You say you've been there for 4 years? Dealing with ignorance and people trying to define your worth and value for 4 years? It sounds like you've already gotten through this with dignity and strength and that is amazing and commendable. And that you work with these children despite all that with the compassion your fellow work companions lack, is even more commendable.
From what I have read I think you'll get through it. Am sorry you went through that. People will always try to define our worth because they are projecting their own insecurities. If they don't do it, then they feel weak and worthless and low. If you can learn how to rise above it and let it wash over you (it won't be easy) but if you can learn how to do it, it'll be very empowering and only continue to reflect on their own weakness. They're simply projecting their own insecurities, that is all it is. Credit where it's due, you've gotten through I'm sure much worse than them, and will get through this too.