This is a prime example of "Confirmashaming" by Dailylook.com. While browsing the website, customers may be presented with a pop-up offering a $20 off coupon code. If the customer chooses to decline the offer, they are prompted with the X button or a message below the "Get Starter" button that is designed to make the customer feel guilty for declining the offer.
The message, "No thanks, I don't want to look my best," is irrelevant to the offer, and it is intended to manipulate the customer into providing their email. This is a manipulative and disrespectful approach, it should be avoided.