Fuji Seafood Buffet

Boiled crawfish was just boiled in water. Meat to cook was labeled ribeye but it was pork chops. When done eating and paying, the waitress opens up the pay book, goes through the cash at the table and then ask how much is for tip? All of it? Rude and putting me on the spot to give the whole full amount of my change. I have never had a waitress do that at the table. You bring my change then I tip accordingly to the 15-20 percent. Not to mention its not a full service waiting.