Why is it considered impolite to put your elbows on the table while eating?

Question

Who decided it was rude?

What's the meaning behing it?

Answer 1

it is generally impolite to put elbows on tables since doing so creates a risk of tipping over bowls and cups.

Answer 2

Generally, if you keep your elbows on the table, it may cause you to slip away an object, utensil, or spill something off the table. That's why its always safe to keep your elbows off the table when eating.

Hope that answers