Did you see! The Beloved Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم cursed eunuchs and ordered that they be turned out of homes.
Question: What about calling a non-eunuch a eunuch?
Answer: This would hurt a Muslim’s feelings, therefore, it is a sin and leads to Hell. In fact, in case of the filing of a case in an Islamic ‘Adālat [court], the punishment of 20 whips can be given. In a blessed Ḥadīš, the Merciful Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم stated: If one person says to another, ‘O eunuch!’ Then inflict 20 whips upon him. (Sunan-ut-Tirmiżī, vol. 3, pp. 141 Ḥadīš 1467)
The famous commentator, Ḥakīm-ul-Ummat, Muftī Aḥmad Yār Khān عَـلَيْهِ رَحْـمَةُ الْـمَنَّان commented on this blessed Ḥadīš: A eunuch is a man whose body parts are flexible and voice and body-language are feminine. Calling somebody a eunuch is an insult and therefore, the victim can make a claim for abuse of honour and this punishment (20 whips) can be inflicted upon the criminal. Similarly, if somebody said any of these to another person, ‘O alcoholic! O Zindīq! O pederast! O interest-taker! O Dayyūš (shameless)! O cheater! O mother of thieves!’ Then he could be inflicted with the same punishment.
(Mirāt, vol. 5, pp. 326)
Question: Can we call a natural eunuch a eunuch?
Answer: Not without a valid Islamic reason, because this would embarrass and hurt him, just as it is prohibited by Sharī’aĥ to unnecessarily call a blind man ‘blind’, a short man ‘shorty’ and a tall man ‘lanky’, it is also prohibited here. In fact, the embarrassment-element is stronger here.