AITBF for blocking my friend ?

So, I had a friend that I recently blocked,
What happened is that I talked to another friend, about how the first friend used to make a group chat about insulting people she didn't like.
I wanted to fit in so I did as they did.
So once the second friend heard this, she immediately warned her friends about what first friend did.
First friend did other things that hurt me, she publicly insulted me because I said she is a big talker (not wanting to insult her).
Anyways, first friend removed me from the group chat, removed me as her friend, and removed my roles from her server.
I immediately contacted her asking why did she do this, and she answered that I should ask my "other friends" (second friend's friends).
So once I understood, I completely removed her from my life. Even though I removed her, she sent one of her friends to tell me that I am an asshole for this and etc.
In my opinion I may be the asshole for blocking her immediately, I think I overreacted, but I want to avoid as much conflict as I can.
So AITBF ?