acts different around friends

My gf acts different with me around her friends. She has this aggressive, idgaf, don’t touch me attitude and vibe to her like she’s too cool. She also makes a lot of jokes about me. We hung out with my friends a few weeks ago and she was herself. I know I’m not even going to be able to address it without her getting mad. I feel like everything I like or like to do becomes “joke” and bullying material when we’re with her friends. It sucks. Any advice?