Sorry, but I think YABalittlebitU here. Their house, their rules, surely?
If they are overseas, then presumably by asking you to exchange the outfit what they actually mean is that they like it, and would like another one (in a bigger size) - but as they won't have the same stores in their country, to be able to achieve this you will have to exchange it for them. Why isn't that OK? Do you begrudge the gift? Surely you should be pleased that they like it!
I would be pissed off if someone was leaving the lights on in the house as well - not just because of the cost of the electricity, but also because the light on disturbs me. I find it much harder to sleep when there's a light on, even on the floor below us.
And as for these issues:
"I was told I had to remove my washing from the washing line at night and re-hang it in the morning, because it would get dewy. I explained I didn't really care if that happened." Sounds like they were giving you some helpful advice - up to you to ignore it thoug.
"They have a separate washing machine for their kids laundry." Lucky them to have two machines. Presumably it helps to keep the laundry sorted if it's done this way, and means they can do two loads at the same time?
"Every perishable item must be frozen on date of purchase in a labelled bag. Including the bread I bought. I seriously felt like I was on wife-swap." Well why not do this? Keeps food in the best condition, and labelling it is sensible - how many times do you look at something in the freezer and wonder what it is?!
"The TV had to be turned off at the wall whenever it was done with." Good. This is a major environmental issue - it wastes way too much electricity keeping things on stand by.
^"Pots weren't to be dish washed, neither knives, plastics and other random stuff for whatever reason." There are lots of reasons why things shouldn't go in the dishwasher. I have some very expensive saucepans and glasses that mustn't go in the dishwasher, otherwise they will be spoiled/scratched by the detergents, and I would be really* annoyed if you ignore me and put them in there because you couldnt' be bothered to wash them by hand.
"I didn't expect to be waited on hand and foot, but I didn't expect to spend my evenings washing recycling waste either (scrubbed with detergent)." I, personally, don't wash my recycling, but actually it's not a bad thing to do - there can be serious fly and/or rat problems caused by food left on stuff that's been thrown into the recycling bin that hasn't been washed.
It sounds like you just have different views about things, and these hardly count as them being unhospitable.