Spitting it out tells you something
A spit can mean the texture was too hard, the piece was too big, or the taste was new. It is information.

Stay calm
Stay calm, offer the familiar food, and stop for today. The same food can come back softer, or smaller, another day.
A spit is not an insult. It is a child finding out the piece did not work.
What to change next time
Softer, or smaller, not both a lecture and a bigger piece. The familiar food still fills the plate.
If they spit a food that was hard or round, leave that shape off. Choking worries belong with your child’s doctor, not with another try tonight.
Do not scold
Scolding a spit teaches them the food is dangerous to attempt. Wipe, offer the yes, and end the new food for this meal.
One spit does not retire the food. It retires that texture for today.
A sentence you can say
“That’s all right. Your rice is here.”