The title says it all

I [20,N] am about to start University (for context : this is taking place in a small country located in western europe) in a few weeks and i already managed to join a small whatsapp group. We all have been texting pretty frequently for the past week or so going as far as even arranging a first meetup. I am genuinely excited to get to know these people because most of them seem really fun. Most but not all. Can ya all believe that, i have been in the group for one week and i already have a person who allegedly ( i have bpd so we can never be sure) dislikes  me.
 It all started when she used a WhatsApp sticker with an anti immigrant slur (for context: there are a few immigrants in that group but she isn't one of them) then she started to randomly hate a lower income district with the majority of its population being immigrants. Now i have met a fair share of people in my life and randomly deciding to talk about "how bad" this district is, is an instant red flag to me. Especially if you are not an immigrant yourself. Heck, allegedly she hasn't even been to this place. This is where i got real angry with her because my brother and a few of my friends actually resign there. She kept brushing me off and ignoring what i was saying so the majority of the conversation was just me accusing her of things. Now she keeps making annoying and passive aggressive comments into my direction for whatever reason.

example:
Since none of us have met before some people were listing who they are excited to meet first and a lot of people mentioned me. Others were mostly agreeing but she had to share with everyone how she actually does not want to meet me. She also keeps replying to my messages with passive aggressive comments which made me not wanna text in that group. 

Obviously all of these things have made me really mad and now i feel like i could just randomly hit her the moment we meet in real life. i do not know how to deal with this anger and what to do. 
I told some people close to me about this and most of them advised to stay in the group and "just ignore her". Easier said than done especially if you have bpd😩. Should i leave