This Thanksgiving, the open-versus-shut debate has grown even louder.

Walmart, Kmart, Macy’s, Target, RadioShack and many other major retailers are proclaiming that they will be open on Thanksgiving Day to make shoppers happy. But Costco, Marshalls, GameStop and T. J. Maxx are riding the backlash against holiday commerce by boasting that they will not relent: They will remain closed that day to show that they are family-friendly and honoring the holiday.

But even as retailers vie for every dollar during a very competitive season, Tony Bartel, the president of GameStop, views this debate as open-and-shut. “For us, it’s a matter of principle,” said Mr. Bartel, whose company has 4,600 stores nationwide. “We have a phrase around here that we use a lot — it’s called ‘protecting the family.’ We want our associates to enjoy their complete holidays.”

In a big difference from last holiday season — when more retailers decided to open their doors on Thanksgiving with enticing deals — this year others are firing back and promoting their decision not to join the rush to push Black Friday into Thanksgiving Day. They are happy to tell the world that they will remain closed on a beloved American holiday.

“It’s an important holiday in the U.S., and our employees work hard during the holiday season, and we believe they deserve the opportunity to spend Thanksgiving Day with their family and friends,” said Richard A. Galanti, executive vice president and chief financial officer at Costco Wholesale, the nation’s second-largest retailer after Walmart. “We’ve never opened on Thanksgiving, and when the trend to do so occurred in the last couple or three years, we chose not to because we thought it was the right thing to do for our employees.”