Can creditors classify an account as a charge-off because it was included in a chapter 7 bankruptcy?

Yes and no. If an account was already charged-off before the bankruptcy, it can be reported as a charge-off. By law, the creditors must charge-off accounts included in bankruptcy, BUT they can not REPORT that charge-off if it happens AFTER the bankuptcy. Negative reporting on discharged debts is a violation of the permanent injunction of the discharge.