DEAR ABBY: I am in my 30s and moved out of my parents’ home 10 years ago. Last week I decided to visit them, and we went out to eat. Dad has a habit of sending his food back to the kitchen — “My steak isn’t cooked enough,” or “My food is cold. Could you warm it up?” He even does this at restaurants that aren’t fancy. Dad has done this my whole life and he’s in his 60s. It’s embarrassing for me and Mom, and it frustrates the cooks and waitstaff. Is there a polite way of telling him to ...