Grant him permission. (and also added: ) He is a bad son of his tribe or he is a bad person of his tribe. When he came in he used kind words for him. 'A'isha reported that she said: Messenger of Allah, you said about him what you had to say and then you treated him with kindness. He said: A'isha, verily in the eye of Allah, worst amongst the person in rank on the Day of Resurrection is one whom the people abandon or desert out of the fear of indecency. (Using translation from Muslim 2591a)
رَجُلًا اسْتَأْذَنَ عَلَى النَّبِيِّ ﷺ فَقَالَ ائْذَنُوا لَهُ فَبِئْسَ رَجُلُ الْعَشِيرَةِ أَوْ بِئْسَ رَجُلُ الْعَشِيرَةِ فَلَمَّا دَخَلَ أَلَانَ لَهُ الْقَوْلَ قَالَتْ عَائِشَةُ يَا رَسُولَ اللهِ قُلْتَ لَهُ الَّذِي قُلْتَ فَلَمَّا دَخَلَ الْبَيْتَ أَلَنْتَ لَهُ الْقَوْلَ قَالَ يَا عَائِشَةُ إِنَّ شَرَّ النَّاسِ مَنْزِلَةً يَوْمَ الْقِيَامَةِ مَنْ وَدَعَهُ أَوْ تَرَكَهُ النَّاسُ اتِّقَاءَ فُحْشِهِ