What does " 예의범절이 없네" mean?
and " 공과 사 좀 구분해"

Question

Answer

1. '예의범절이 없네' literally means 'don't have manners'.
(예의범절 = manner, rules of etiquette)

2. '공과 사 좀 구분해' means 'keep your public life and private life separate'.
공(公) = public
사(私) = private

Answer

예의범절이 없네 means 'you are really rude' and  공과 사 좀 구분해 means 'i think you should separate the official things and the personal(private) things.'