I've had the same thing from the same place a few times before and didn't get sick. Maybe a one off thing where someone stuffed up. It could happen anywhere but it's still unacceptable.
I also could have been the only one last night or there could have been many others. It all depends on how far along the bacteria has spread. Finally, it may not have happened just last night. Maybe a person gets sick once a week, month, year. Unless you have this information you don't know if employees are being negligent or not.