This is the weakest insult I've ever heard.
If you look at it as an attack, then yeah it is.
If you look at it from a situational view, then he has a good point. I guarantee by the time you are 16-17 you'll have been involved in a social situation involving harmless experimentation of alcohol at some point or another, and I'm sure you wouldn't want some 13 year old ruining the fun.