Manager telling me off for something in the break room on my break

This is honestly why I dont use the break room. I usually take my breaks outside around the back so no one bothers me. Today I decided to use the break room for once, my line manager and another manager is there in a meeting that for some reason they decided to take in the break room despite having multiple offices. I sit down and 10 mins into my lunch my line manager has a go at me for something I wasn't told to do but she insists that I was. She then rants for five minutes about this. After she left I just went back outside, honestly just going to take all my breaks out here from now on. The entitlement is ridiculous, I dont get paid for my breaks and therefore I am not paid to listen to this. It's my first week here after a transfer and I already want out.