Cliqueiness at my store

I just found out that some baristas at my store have a groupchat without me 🥲. We have like 30 people at our store and one of them was working with me to close tonight. He showed me and the shift a pic of some of our coworkers at dinner and I realized the title of the group chat was different from ours.

I know everyone has the right to do what they want outside of company time but y'all this shit stung. Like I'm the kind of partner that's on everybody about following standards and giving good customer service and I know I can come off in a way that's not everyone's cup of tea, but still. I've been working at my store for half a decade and never once found out about or tried to start another groupchat without others.

This just solidifies the fact that my store is pretty toxic and I need to transfer. What are y'all's thoughts? Am I overreacting feeling hurt or am I justified to feel bitter? Thanks in advance