Indeed, thought everyone and their aunt knew that acohol dehydrates you. So as long as you are not stupid, you're not hurting your self by drinking beers. Thats like saying you should climb in trees because you die if you fall from a high enough distance. Or you shouldn't eat, because you can choke on a food bite.
Also, just drink some water before you go to bed and you are perfectly fine the next morning. Or even have one glass of water for every second beer you drink; 1. you wont get stupid drunk and 2. you wont feel anything the day after.