Statement:
An average person in Sri Lanka drinks less alcohol than in Vietnam

In the Alcohol average daily consumption rating Sri Lanka holds position #87 2016 out of 189 and Vietnam is #27 out of 189 2016.
Position of Sri Lanka is better than position of Vietnam.
Vietnam is leader of the "Alcohol average daily consumption" rating. So people in Vietnam are more likely to experience problems related to the consumption of alcohol in social, healthcare, and economical areas, compared to Sri Lanka

Referencies:

  1. Alcohol average daily consumption 2016 by WHO
    The countries in the rating sorted by 'Both sexes' in descending order.
    Sri Lanka 'Both sexes' value is 32.2
    Vietnam 'Both sexes' value is 49.3