"It strikes me as bad manners for a magazine to accept one of my advertisements and then attack it editorially - like inviting a man to dinner then spitting in his eye"

This quote by David Ogilvy speaks with the importance of regard and courtesy in business. He is revealing his frustration at a publication that accepted his ad, however then criticized it in an editorial. He compares this to inviting somebody to dinner and after that spitting in their eye, which is a clear indication of disrespect. Ogilvy is stressing that it is bad good manners to accept somebody's service and then slam them in a public forum. He is also recommending that it is important to treat individuals with regard, even if you disagree with them. This quote is a pointer that it is necessary to be considerate and expert in organization, even when there are arguments.