I think it's fair. They didn't just drink juice, they drank in public in the month of Ramadan, which is a holy month of fasting. All public restaurants and cafes close during daily hours, really you can't miss it. Residents know that, whether Muslim or not. Someone once asked me about vacationing in Dubai and I told them not to visit in Ramadan. Every country is free to have its own laws, whether based on religion or not.