وَمَنْ ذَكَرَهُمْ بِسُوءٍ فَهُوَ عَلَى غَيْرِ السَّبِيلِ
Whoever mentions them disparagingly is not upon the right path.
Respectful mention is distinct from discussing scholarly differences. Understanding an opinion, considering a religious issue and weighing evidence do not require insult or contempt.
Respect and fairness should govern speech about scholars who served the religion.