I have noticed there is lot of people on this website who curse and insult Muslim rulers, ranging from mohamed bin salman (حفظه الله), Sheikh Khalifa bin Zayed (حفظه الله), and even Hassan Sheikh. I will explain to you why it is forbidden to do so,
[حسن] - [رواه الترمذي] عن أبي بكرة رضي الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: «من أهان السلطان أهانه الله»
This Hadith reads anyone who insults the ruler, Allah will insult him. It is graded as Hassan.
Hudhayfa ibn al-Yaman reported: The Messenger of Allah, peace and blessings be upon him, said:
"Rulers after me will come who do not follow my guidance and my Sunnah. Some of their men will have the hearts of devils in a human body."
I said, “O Messenger of Allah, what should I do if I live to see that time?”
The Prophet said: "You should listen and obey them even if the ruler strikes your back and takes your wealth, even still listen and obey." Source: Ṣaḥīḥ Muslim 1847
Allah said:
يَا أَيُّهَا الَّذِينَ آمَنُوا أَطِيعُوا اللَّهَ وَأَطِيعُوا الرَّسُولَ وَأُولِي الْأَمْرِ مِنكُمْ ۖ فَإِن تَنَازَعْتُمْ فِي شَيْءٍ فَرُدُّوهُ إِلَى اللَّهِ وَالرَّسُولِ إِن كُنتُمْ تُؤْمِنُونَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ ۚ ذَٰلِكَ خَيْرٌ وَأَحْسَنُ تَأْوِيلًا
O you who believe, obey Allah and obey the Messenger and those invested with authority among you. If you disagree over something, refer it to Allah and the Messenger if you truly believe in Allah and the Last Day. That is better and most suitable for determination. Surat al-Nisa’ 4:59
Those of you who insult and belittle the rulers, you are on the verge of kufr.
[حسن] - [رواه الترمذي] عن أبي بكرة رضي الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: «من أهان السلطان أهانه الله»
This Hadith reads anyone who insults the ruler, Allah will insult him. It is graded as Hassan.
Hudhayfa ibn al-Yaman reported: The Messenger of Allah, peace and blessings be upon him, said:
"Rulers after me will come who do not follow my guidance and my Sunnah. Some of their men will have the hearts of devils in a human body."
I said, “O Messenger of Allah, what should I do if I live to see that time?”
The Prophet said: "You should listen and obey them even if the ruler strikes your back and takes your wealth, even still listen and obey." Source: Ṣaḥīḥ Muslim 1847
Allah said:
يَا أَيُّهَا الَّذِينَ آمَنُوا أَطِيعُوا اللَّهَ وَأَطِيعُوا الرَّسُولَ وَأُولِي الْأَمْرِ مِنكُمْ ۖ فَإِن تَنَازَعْتُمْ فِي شَيْءٍ فَرُدُّوهُ إِلَى اللَّهِ وَالرَّسُولِ إِن كُنتُمْ تُؤْمِنُونَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ ۚ ذَٰلِكَ خَيْرٌ وَأَحْسَنُ تَأْوِيلًا
O you who believe, obey Allah and obey the Messenger and those invested with authority among you. If you disagree over something, refer it to Allah and the Messenger if you truly believe in Allah and the Last Day. That is better and most suitable for determination. Surat al-Nisa’ 4:59
Those of you who insult and belittle the rulers, you are on the verge of kufr.