Costco might not be your favorite place to shop, and that is okay. Simply tell the interviewer your favorite place to shop avoiding any of its competitors. Be sure to mention what it is that you really enjoy about that store. Perhaps you like their environment, fun crafting options, or maybe you enjoy looking at all of the tools & paint they sell. You might state, "My favorite place to shop is Hobby Lobby. I love wandering the aisles thinking about how I will re-decorate the next room in my house!" Or, you might share, "I really like shopping at Home Depot. I love their Do-It-Yourself clinics." As long as you stay away from Costco's competitors, feel free to share your candid thoughts! If Costco truly is your favorite place to shop, that's great! Share with the interviewer that Costco is the best, and share why you keep coming back to their stores!
"My favorite place to shop is Hobby Lobby. I love wandering the aisles thinking about how I will re-decorate the next room in my house!"