Is it okay to rub my Sun Conures back

by Brenda
(Chattanooga, Tenn. )

I have a Sun Conure that is two years old. She is on Harrison's pellet diet and is doing well. She favored me until my husband won her affection by rubbing her on the back and also he rubs what we think is her oil gland on her back. I told him to stop but he will not. Could this be harmful in any way to her health?