Is OTHER wrong in the post ? POST : Ok so I didnt know this subreddit existed until today and I made this account just for this story.
This is pretty long so I'll put a tldr at the bottom.

So my mom has had this friend she met in church for as long as I can remember. We'll call her Karen for the sake of the meme. 
My mom and Karen used to be best of friends as I was growing up, so naturally my sister and i would play with her kids. Karen had 2 daughters, OS &amp; LS (older sister &amp; little sister.)
Now the daughters could not be any more different. OS is your stereotype blond airhead, while LS is more quiet and reserved.
Now the sisters really didnt like spending time together so OS would come bother me while our sisters played. 

All of this is important to understanding the situation.

So as I was growing up naturally me and OS got to be close friends, I even had a massive crush on her several years ago (which will forever be one of my most hated memories.)
Due to this I would almost instantly take her side on pretty much anything. Karen liked to brag to other people in the church about how LS was such a troubled child when in reality she was just different. Looking back it's quite sad she had to grow up like that.
Anyway, as I got older things I hadn't noticed before began to appear about Karen and OS.
Karen had a tendency to cause drama for no particular reason. Once my sister told OS that her shirt didnt match her shoes and Karen got PISSED. She started to yell at my mom on the phone about this all the time. They didnt talk at all for nearly a month.
I have two instances of when Karen would send me angry texts about something I did that pissed her off. Keep in mind I was a child when those happened.
As for OS, as we grew up I noticed something about her that I hadn't before. Ever conversation we had would always be about her, and nothing but her. Even if I tried to take the conversation another way she would just wait for me to finish my sentence then drive it back to her.
As of late I've been avoiding them both. One of the instances with Karen I mentioned before is actually about me avoiding them. 
I'm sure the whole situation isnt done, not until I move away anyway.
If you've gotten this far, thanks for reading and please tell me, am I the asshole? I've been wondering if my decision is right or not.

TLDR; Childhood friends, Karen and her daughter became toxic and undesirable to be around so I cut off contact with them.
