He better watch out. Footage of a heated confrontation between customers apparently taken inside a Costco emerged the day before Thanksgiving — sparking online debate about naughty shopper behavior as gift-buying season gets underway. An aggravated man rammed a woman’s shopping cart with his own as he impatiently tried to push through a sea of shoppers in an aisle, according to a video a fellow customer posted on a Reddit Costco thread, which is not affiliated with the mega-chain store.