Summer students disrespectful of my home.

Leave the food where you found it. When they come back just beckon them over to it, point to it and give them a look. That should be enough. If it's not show them the bin and tell them please use it!
The fact they ate their own snacks from outside is hardly disrespectful. You don't expect them to solely eat from your home. It's more polite they buy their own snacks really, I'd have thought.
I don't think you should start reading them the riot act or anything.
But maybe tell them to do own laundry and clean bathroom. If you guide them through where the cleaning stuff is and how to do it briefly.

Presumably you are being paid a fee to host them? Make it clear where the bin is with instructions in their language. They are thoughtless teens for sure possibly first time away from home.

Does that entitle them to treat the house like it's a shit hole?

Why are so many mumsnetters batshit? OP has posted about a perfectly reasonable concern, asking for advice on how to respond to the issue, and people have decided that she’s some kind of insane prison warden depriving teenagers of food.

It is perfectly reasonable to have a word with 15 year olds about not leaving rotting food in their rooms and it is also perfectly reasonable to say ‘is everything ok with the lunches I’m making? If there are things you would prefer just let me know’.

Some of you need to calm the fuck down and stop being so rude and antagonistic.

I agree, no point rocking the boat when there's so little time left before they go. Also they may well be used to different food and not actually like yours, regardless of how wonderful you might think it is.

I wouldn't have a problem with them bringing in food. Maybe they went to a shop? And if they did some lunch swapping, so what?

I would remind them about getting rid of the waste though.

How do you know they are giving away food? They might just be hungry and bought a snack from the shop like teens up and down the country do every day.

But how do you know they are other people's packed lunch? Couldn't they just be buying food from the shop like normal teenagers?

A bit dramatic have you never had teenagers?

Sure you did!

I think you're being too rigid. You think your food is fabulous maybe they don't and they're too polite to say something. Just remind them to put all food waste into the bin. Job done!

Clearly none. Quite worrying really. This woman is clearly unhinged and about to rip into a couple of 15 year old girls over a mouldy sandwich !!!!!!!

It's not controlling this word is losing its meaning and it is her business because it coming out of her pocket not yours. The op is going out and buying food that she thought they would like. Instead of communicating with the op what they would like to eat they would rather be secret squirrel's and hide food in their room to eat. They are 15 year old girls the immaturity is there and she should speak to them about it. It's all part of life's lessons to learn on how not to take the piss.

My friends and I swapped lunches at school all the time. My best friend was Indian and we preferred each other’s food! Our mothers didn’t mind at all.

That’s really none of your business. As someone who used to arrange homestays and was an exchange student myself, I’ve not come across a family who would care about that. It’s very controlling of you. As for the rotting food, speak to the coordinator to chat to them on your behalf.

No. But that's not what the majority of posters thinking wtf have posted about ...
Or to coin a threadfamous phrase....'wrong wrong wrong' 😂

Would you let your children do the same to you treat your house like a shit hole or give away your food after asking them what they wanted. I wasn't brought up with silver spoon in my mouth or thought I was entitled.

I haven't got the money vibe from the histrionic posts from the op, no 😂

It is about money isn't it? That's what I got from her op. They are taking the piss and should say something if they don't like it. Op has said she asks them what they want to eat it's not like she's not trying. If someone lets you into their home to stay for a few weeks it doesn't entitle them to abuse her home or the food she buys.

Bottom line is people are only replying to what the ops posts literally said before backtracking 😂

They always do when it's not your money.

I get why she is annoyed because a lot of people in real life wouldn't tolerate it. You have complete strangers who you can't see posting shit that they wouldn't tolerate but want to make the op feel like an arse for not wanting to tolerate the rubbish or food that has been left or given away. Food costs money and if they don't like it then the op should try to offer alternatives so she doesn't waste her money. Bottom line is everything costs money.

Two packed meals? Why don’t you provide a proper evening meal?

"And likewise, if it's anything like the place I last worked if the students came into the office and said "I want to move host families because my host mother told me off for leaving rotting food in my bedroom," we'd have explained gently why that wasn't acceptable and attempted to resolve sensibly."

I like this comment it's all about having a balanced view and not allowing young people to abuse a hosts hospitality. Which it's clear they are and should be spoken to or else they will do it somewhere else.

You do sound ever so slightly bonkers OP.