I love playdates. A lot. Passive parenting is my forte and it's great to pass the time with an adult that I can actually have an intellectual conversation with. But when we get to your house and it's super clean I a) feel like I need to police my son so he doesn't trash it and b) immediately decide that when I do manage to reciprocate and invite you to a playdate, it must be in the morning after I've been able to clean the night before.
If my house is a mess when you arrive, take it as a compliment because it means that I don't mind you seeing the daily chaotic reality in which we live :)