How to train a boy to behave properly.

Last week we went a dinner. Everybody was quiet with good behavior
except my sixteen-month-old son. He not only dropped his cup many
times, but also screamed loudly when he was sitting on highchair. My
DH and I were very upset. My DH noticed a little girl who was about
the same age as my son age sat on her highchair without any bad
behavior during the whole dinnertime. We want to know how to train a
boy to behave properly.