The world outside is a mirror of our self-perception.
In these first months of transition I have seen that 100% of the times if I get "sir'ed" there is a reason INSIDE me.
In the sense, maybe I am too much with the mind in the clouds, day dreaming, forgetting to smile, going out
dressed en femme but not totally convinced with my look (maybe the hair, maybe the make up).
In your particular case, nevertheless, I would do
1) never return in that shop
2) return in that shop but accepting her view. If she sees a man it is my "problem", not hers.
