Atty. Tristan filed a motion to disqualify Judge Robert from hearing a civil case on the ground that the latter was the classmate and fraternity brother of Atty. Mark, Atty. Tristan's opposing counsel. Judge Robert denied the motion on the ground that under Rule 3.12 of the Code of Judicial Conduct, he is not required to inhibit in all cases where his classmates and fraternity brothers are participating lawyers in cases before him. Is Judge Robert correct in denying the motion?