This is a ridiculous argument. If a company is responsible for a problem, that company receives the blame. That's what responsibilityis, after all. In this situation, there is no "problem" to be resolved or that should have been avoided in the first place. The sale is announced and is in place from Monday through Friday. Your money spends just as well as anyone else's money. I fail to see how there is an issue of "equality" here at all. If all companies were to routinely observe with sales the holidays of countries in which they have customers, then when wouldn't they be having a sale?
I'd like it if they observed other countries holidays instead of only American ones, why should only American holidays be celebrated by discounts?