AIO for wanting to cut my very close friend off

So basically, I have VERY FEW close friends, I tend to keep to myself in school a lot. So, I have this friend, we’ll call her Bri. I’ve been friends with her four years now, but I suppose I’m just now noticing all these things she’s doing. She’s constantly passive aggressive and not subtly at all. Her and my other “friend” often gang up on me as well. She does this thing where she’ll insult me and then say “kidding, I love you!” But today was the worst honestly. I have a sore throat from being a scare actor who has to scream a lot. So, Bri and some of our other “friends” (I say in quotes because they aren’t really MY friends, just people who talk to me when they have nobody else who’ll tolerate them) decided to make this whole big deal out of it, they were like “oh she’s gross stay six feet guys!” And other things similar. also at the lunch table, everybody kept huddling together and saying that I was sick. But I had explained to them why I sounded so raspy, they just laughed at me. I’m kind of just sick of being constantly bullied by other girls in my school, but my other close friend said I was overreacting to cut her off. I’ve cut off several other close friends for other reasons, very recently. (One of them wouldn’t stop talking about me behind my back, the other constantly ditched me for her bf who she’d known three weeks.) so I’m already feeling kinda shitty.