Erm I've been to Orlando twice and am certainly not "chavtastic"!!
No children either, so call the holiday police, quick! Both times DH and I went with friends. And the last I was aware, fun isn't limited to a certain age bracket.
I rather think that if you're with children you probably don't go to the sort of places you'll see it, but we drank a fair bit and saw plenty of drunk people. We stayed at Universal both times, and maybe drinking is just more typical there as there are a couple of clubs etc as opposed to Disney.
For me, Disney is my idea of hell on earth, but I love rides so Universal suits me fine. We could be having cocktails and chilling out and decide to go on a ride and have a stroll over within 10mins, no queuing. I have to say we did avoid International Drive as much as possible as it was a bit tacky, and you can see the decline as you walk along it. And we had great fun playing Spot The Brit as we walked along it too as you can tend to spot them a mile off.
Have to say, we go on all different types of holiday, have done road trips, snowboarding, safaris, beach holidays etc, and there is no law that says it has to be brimming with culture. Whilst I don't eat or drink at British places on holiday, each to their own!!