good/bad form

bad form

Behavior or actions that are considered socially inappropriate, distasteful, or rude. Many people still consider it bad form to ask a woman her age.
See also: bad, form

good/bad ˈform

(old-fashioned, British English) a way of doing things that is socially acceptable/not socially acceptable: I think it was very bad form for Joe to arrive late for the funeral.Apparently, good form requires you to wear a hat on these occasions.
See also: bad, form, good