Why would she interpret, "we should go somewhere else," as, "we should just go home"?
Being wowed by a family restaurant. She seems like a person who doesn't get out much.
If I heard her saying it's fine to order all that because he's there, I would perhaps just refrain from ordering anything.
Spicy food is all about how used to it you are. Sour is a bit of a personal taste, since some people interpret that as something that's gone bad, especially if it's any kind of dairy.
Eating Thai food makes you a gourmet? Just because people don't eat it that often?
So jelly, that trainwreck of a girl.
Don't worry about it. Your own life and health, both mental and physical, come first.