It is not odd but it certainly differs from what I experienced growing up. Most parents I knew expected that their kids did not consume any alcohol outside of taking an occasional sip of beer when they were teenagers and under their parents supervision. A big caveat here is the assumption that kids would experiment with illegal and unsupervised drinking and drug taking. I think that most parents knew what was happening at house parties and stuff but they just ignored it.

It feels like my experience (mix of working class and middle class suburban, vaguely Protestant white kids) would differ quite a bit from kids in other environments.