Sounds like when I worked at GCA. We built semiconductor process equipment. You know, the kind that goes in clean rooms. Management made us all wear white lab coats to make things look clean. Meanwhile, the assemblers and techs put food, drink, and cigarettes (1980s) on the machines in full view on the assembly floor.
In the telecom labs where I once worked there was a rule against food and drink at the bench.
Uh, I'd be more worried about the drinks getting into the equipment if spilled. And the ESD generating properties of the plastic containers. We got rid of styrofoam cups a few years ago in favor of paper - help the environment and cut ESD at the same time, but I make a point of not bringing drinks into the lab ever and encourage others to do the same.