The only guide to acceptability in texts is whether the recipient understands the message the sender wants to convey. There are absolutely no 'rules' about what we should say.
The response may come across as a little terse, but it's not rude.A: We should eat out tonight.
Me: Eat what?
I think that’s quite rude and it suggests I don’t quite want to eat out or maybe even eat.
Student or Learner