Edam, what do you mean by messy play? Are you talking about painting, playdough etc? In that case, people here would either have their kids do it outside or in the kitchen on the tile, or just say "Well that's what pre-school is for".
I think a lot of my neighbours also have specific areas where the kids can play. For example we all have formal living rooms as well as family rooms. The kids would be able to play in the family room and their own rooms but not in the living room.
As for me, my carpets aren't beige. They're a mid-green colour, but they still get dirty if they get mud or anything on them. And my kids can (and do) play anywhere in the house.
What about eating? I, and most of my neighbours, have a policy that food is only allowed in the kitchen, to keep crumbs under control. (I'm talking about snacks, obviously, not meals.)
Maybe it's different because we're in Florida so most people are in sandals year round if they're not barefoot. But it's hard for me to imagine being grossed out by the idea of people taking their shoes off in your home or vice versa.