King Solomon instructed, “Drive out the mocker, and out goes strife; quarrels and insults are ended” (Proverbs 22:10 NIV).
Any employee that makes light of company policy or rejects discipline will cause problems in any business. Insist that all employees demonstrate a respectful attitude toward the business and all management staff. Document negative behaviors and discuss them with an offender, insisting on a change of attitude. If no improvement is made, revisit and add consequences, including dismissal, if improvement is not made.
You will then create an effective business team.