Only if it was done to make a teaching point. If it were done to make a doctrinal point, it’s a Matthew 18 issue.
Perhaps, but the mission of the Pastor Teacher, with a spiritual gift, ..not an academic or mental gift, but a spiritual gift, is to teach believers the Word of God.
The Word of God, once circulating in the thinking of the believer is then used by God the Holy Spirit to sanctify the believer. If the believer drifts out of fellowship, distracted, or thinks independently of faith in Christ, then he has to repent his sins and confess them to God through faith in Christ, before the Holy SPirit can continue His ministry.