Is it normal that my friends turned their backs on me during an intervention?

So... we have one friend that is nice deep inside, but always acts like a selfish asshole. His personality is very authoritarian. He is the self proclaimed leader of our gang and always wants to order people around. He is also kind of an "ignorant know-it-all", he wants to "win" all discussions, even if he isn't well informed about the topic. He is also quite self-centered sometimes, it is as if he didn't care at all about other people sometimes. We think that maybe he needs to seek professional help.

Me and my friends have been complaining about him for a long time already. Personally, I didn't have so many problems with him, but all my other friends had some serious issues with him. We have always been trying to talk to him about these issues, but he always gets aggressive as soon as any kind of criticism appears. Finally, we decided to make an "intervention", to finally tell him everything that we feel about him. My friends decided that I was going to be the one to lead the whole thing.

We all reunited and invited him over. As soon as the "intervention" started, he began being very aggressive, as always, but I didn't stop. However, something weird happened, my friends suddenly felt sorry for him and pretended like they didn't agree with me. During this meeting, they said to him that they had absolutely no problem with him. In the end, the whole meeting was just me telling him about his issues and being screamed back; while my other friends pretended to know nothing about what I was saying.

After the failed intervention, this friend told me that if I didn't "like him", I should just stop hanging out with him, because he didn't care about our friendship anyway (but I know he said that just becuase he felt annoyed about the criticism). So, I became basically "banished" from the group. All my other friends still hang out with him, and only do certain activities with me now every now and then.

So now I can't hang out with my group that much, even though we miss each other a lot and they hate hanging out with the other guy more and more each day. They told me that he is too "fragile" to handle the truth. So, I ended up being the "bad guy", just so that this friend wouldn't end up alone.

So... is any of this madness normal?