I have no idea why friends who know a person has a problem with food, will take that person out to eat. Would you take your alcoholic friend out to a bar? No! You would avoid that and find alternative entertainments. Sure, it is a normal activity to go out with friends for social eating and drinking and all that, but if one of the friends has a problem with an addictive behavior, I would not take them to a source of their addiction and expect them to have a stress free enjoyable time.