The point is to increase sales. Browsing a website or walking through a store and not buying anything doesn't generate any revenue for a business. Nothing is being consumed, nor is anyone being forced to buy things against their will as the term "ordered" would suggest.
Do you get this bent out of shape when a store has a sale or promotion at any other point in the year?
Lol I'd hardly call it a Pavlovian response. It's more that it's a well known date for stores to have sales on their merchandise, which is why people shop around on those days. I don't see what's so offensive about saving some money on a purchase you were going to make anyway, but I think there is some projection happening here.