Justifiable??

So I’ve been with my GF for a while and last night she had a major event she ran. It was a performance based show and two of her friends performed. I waited in the audience after for quite a bit and I get a text from her saying she’d meet me in the after party location. Now I

was mostly anticipating meeting her friends as I’ve never met any of her friends before. My gf finally comes to the party and alas her friends are not there. I asked where they were and she replied they left. Confused, I of course asked why and said it wasn’t their scene. I began getting a bit whatever because they’re 1) her best friends 2) didn’t want to meet 3) she didn’t even make a point to introduce us. I got home later and the more I thought about it the more it bothered me. I did make a point to tell her I thought it was weird I didn’t meet them. Here was the response.

I’m really not satisfied with this and find her to be tolerating bad behavior and hiding me because her friend doesn’t like the idea her friend has a girlfriend.

Screenshot below

I didn’t want to keep going at it and start conflict but ugh