Just before the pandemic blew up in the US, Costco changed its rules to require showing a membership card to access the food court. (You still don't have to scan a membership card to use the food court kiosks, just show it to get in the door.)
This is true, but if you run into an officious gatekeeper, they will block you 'while they get the approval of the manager' before they will allow you to proceed. I hate going to Costco stores generally but their online operation is generally awesome, including prescriptions by mail.
(Vegetarian here, who also doesn't like cheap-ass pizza, so it is possible this has changed in the last few years without my knowledge.)