If this happens to you, drop me a line.
We are not supposed to be degraded this way. It deprives our students of the unprejudiced view that we are professionals, not visitors or intruders. The quality of their attention is compromised when we are treated differently as separate members of the educational community. (Remember the "separate by equal" analysis of the Warren Court? Separate is inherently unequal.)
A teacher who is being treated this way has good reason to feel degraded as if he or she is professionally unwelcome as an ATR.