Got exposed at a restaurant

Pretty livid about this! We arrived at a restaurant and I was feeding Bub using a cover, as we are being shown our seats the lady just uncovers me, completely exposing my breast! I took a step back and said “I’m nursing!” And the cover got caught on baby’s hand as he’s now crying from the bright lights suddenly in his face, people are looking, and my MIL thank goodness was able to cover me quickly. What the hell though? Why would anyone just lift a nursing cover like that!