We were on the "noro" cruise, May 15-25. We were unscathed, thankfully, but also if the past three years have taught me anything it's WASH YOUR Hands/DO NOT Touch your face. I really wish all cruise lines would strictly enforce the handwashing BEFORE there is an outbreak, not after. I was relieved when they stopped allowing passengers to use tongs, beverage machines, etc.
We had a fantastic cruise (first time on Celebrity) with great ports and the service was great...except for ONE waiter in the MDR who just seemed by annoyed all the time. Wonder if it's the same one the OP had an issue with.