@HumanBeing12345 Got an answer from MS today. It's long so here we go:
14 centuries ago, the leader of Islam was generally the imam of the salah. Therefore, during the time of the Prophet, the Prophet led all/most of the salahs. The prophet was also very fond of Abu Bakr and often asked for Abu Bakr's input on many matters and in meetings. Ali was still young, MS says he was about 23-25, and Abu Bakr and Umar were a lot older and maturer at around their 50s or 60s. During the time of the Prophet, there were a group of muslims who had extreme love for the Prophet's immediate family. When the Prophet was on his deathbed, he asked for Abu Bakr to lead the salah. People came to the Prophet and said Abu Bakr shouldn't lead, he is too soft, he will cry, let a proper imam lead. That was because Abu Bakr was soft and kind at heart and he also wasn't the most Qari material out of all the people. There were many people who could do a better job. The Prophet replied again and insisted that Abu Bakr led the salah. That is already a sign that, even though the Prophet never outwardly said that Abu Bakr should be first caliph, he wanted Abu Bakr to take lead because only the leader of Islam at the time would lead salah. After the Prophet passed away, a consultation happened to decide who would lead Islam next. Ali was still young, 23-25, and he was helping with the Janazah and was really busy at the time. He wasn't part of the consultation and when he found out that Abu Bakr was the caliph, he was upset. After a few days though, he got over it and was really happy again. The Shias though, were not happy. They outwardly rejected Abu Bakr and Umar, close companions of the Prophet and some of the highest ranked muslims, which is obviously wrong. They then formed their own sect and carried on with their lives. Because the Shias had extreme love toward Ali, they incorporated Ali into their lives so much and changed their practices to "bless" Ali - for example, saying Ali is the friend of God in their Azaan. Some sects of Shias even believed that the Quran should have been sent to Ali and there was a mistake in that it was sent to the Prophet - but that was a small sect. Fast forward to the martyrdom of Hussain, the Shias were, rightfully, sad and distraught, because of their love for the Prophet's family. However, they spent 14 centuries mourning the death of Hussain, when a muslim should only mourn for 3 days. The Shias also beat themselves in order to remember and feel the pain of Hussain. This is obviously sinful. In the Quran, Surah Baqarah, Ayah 195, Allah says "do not let your own hands throw you into destruction", meaning do not cause self-inflicted harm.
MS also told me to not speak to Shias lol for the sake of my deen, because they are good speakers and because I am not that knowledgeable, I can fall into their trap and become Shia myself. He said if any Shias wanted to ask questions, to speak directly to him or a Sunni imam 🤣🤣