How does it make you any more stupid than getting wasted? If anything it's safer than getting way too wasted. And how are drugs stupid when you yourself love beer? Come on dude... Ethanol is a drug. It's a legal drug but it's still a drug.
Saying that this custom may or may not be "right" seems a little... closed minded. It's not up to us to judge the customs of ancient people. At least when it comes to harmless things like this.