If someone already dresses in a certain way and is reprimanded for some ethical violation, as opposed to a goof, he is committing a chillul Hhashem. Changing his dress for being called on the carpet will just be interpreted cynically. If he does not think that he is up to it he should not dress that way .
As for working only with and for YEHUDIM (let the creole German rest in peace), make aliya.