For anyone who tells you Islam is a religion of peace or Muhammad is a messenger of mercy…ask them to tell you about the Genocide of Banu Qurayza.
And so this person does not make up stories that Muhammad delivered chocolates and flowers to them, you can read the story here:
https://wikiislam.net/wiki/The_Massacre_of_the_Banu_Qurayzah
In short, Muhammad had a peace treaty with several Jewish tribes, some kept it and some sided with the pagans during a battle. The tribe of Banu Qurayza, stayed neutral but after seeing how savage Muhammad was with the other Jewish tribes, Banu Qurayza who counted at best 2000 are no match to Muhammad’s army of nearly 40,000 – had tried to reach out for some aliance elsewhere – although they strongly denied that.
The reality is that Muhammad had already decided he wanted to clear Arabia of all none muslims in this hadith.
Sunan Abi Dawud 3030
Jabir bin ‘Abd Allah said that he was told by ‘Umar bin Al Khattab that he heard the Apostle of Allaah(ﷺ) say “I will certainly expel the Jews and the Christians from Arabia and I shall leave only Muslims in it.” (Graded Sahih)
https://sunnah.com/abudawud:3030
What happened next stains the image of Islam and Muhammad forever. An absolute massacre. The tribe were attacked in the morning and they put up very little resistance. Muhammad accused them of treason for which they could not have any fair trial. Women and girls taken as slaves and sex slaves, men and boys killed. In one shocking incident presents in the Hadith, a mother pleads with Muhammad to save her boy who is only 13. Muhammad asks his men to strip him to see if he has a pubic hair (evidence that he is now an adult) and it turned out he has one single hair!!
The boy was slaughtered.
This was not just a policy against Banu Qurayza, this was standard policy of Muhammad against all the tribes as shown in the authentic hadith:
https://sunnah.com/search?q=Pubic+hair+boy
Can you not feel the love? Can you not feel the mercy of Islam?