The Rich Man and the Tanner

No Moral. Suggest us a moral of this fable in comment section.
A rich man lived near a Tanner, and not being able to bear the unpleasant smell of the tan-yard, he pressed his neighbour to go away. The Tanner put off his departure from time to time, saying that he would leave soon. But as he still continued to stay, as time went on, the rich man became accustomed to the smell, and feeling no manner of inconvenience, made no further complaints.