If you're wearing the school uniform, then yes, as you still represent your school and are giving it a bad reputation, that is the schools business. If not then no, unless it's one student causing deliberate ABH or worse, then the school has a duty to keep the rest of it's students safe.
This incident, shouldn't have had any consequence from the school, unless he was drinking underage, then they can stick their nose in.
This incident, shouldn't have had any consequence from the school, unless he was drinking underage, then they can stick their nose in.