Drink tickets should also cover non-alcoholic drinks for those who don't drink alcohol. Otherwise it discriminates against non-drinkers and could be indirect discrimination against, say, Muslims.
Their example is about religious discrimination not racism. Also, people like Muslims don't abstain from things like pork, alcohol etc because they don't like it, they're just not allowed to consume those things by their religion. Muslims can consume pork in emergency food shortages and stuff like that afaik, so I'd imagine you could probably find Muslims that have tried and actually like these things despite not being allowed to consume them.