A sheet metal sub is advising me that copper flashing is not compatable with stucco, and that I should use galvanized sheet metal for my weep screed even though the rest of the home is flashed in copper. (Only the lower course is stucco, with no doors or windows, so the incompatability does no apply to the rest of the home) Can anybody confirm this incompatability, or is this guy misinformed?

TIA