Friend had a go at me over a can of Diet Coke

Yeah, this! First comment as usual nails it

Her friend bought the food and drinks for the party. The next morning the party was over.

So the onus is on the friend to make that clear either by clearing up or saying 'I'm saving the rest of the cans.' The OP isn't psychic, she can't be expected to guess the party cut-off point.

And you've not answered the quesio about whether you opened the can, took a sip and then just left it. Probably because, yes you did, and everyone's told you how wasteful they think you are.

Super rude to do that, I’d ask if they minded me taking a can for the journey, it’s almost taking the piss to do what you did. Your poor friend.

Honestly, wouldn't cost me a thought. If a friend was hanging, opened a can of manky Diet Coke ( team Coke Zero), drank what she wanted, and left to go home. I would just empty the can when I was tidying up and but in the return bag. No need for comments or judgement. I often open a can at home, drink some, go out or do something else, forget it and it's flat when I see it again. No big deal at all.

Her friend bought the food and drinks for the party. The next morning the party was over. Op grabs a drink takes sip and like a teenager puts it down because she don't like it or she doesn't want it. When her friend pulls her up on it she mumbles sorry. She forgot her manners I wonder if she thanked her for inviting her over. You don't take advantage of someone's hospitality. The op was in the wrong to say she wasn't is enabling her to do it again. She'll be lucky if she gets a second invite.

Op enjoyed having a couple of sips from the can. If she'd have enjoyed finishing it off, she'd have done so. Enjoyment does not = 'clearing your plate' - it = sating yourself with as much food or drink as you need.

If OP had finished off the can in her friend's kitchen, her friend would still have had to dispose of it. Unless OP had made a point of upending the can and shaking it vigorously over her open mouth to ensure it was completely empty, her friend would still have had to shake it over the sink before putting it into recycling, assuming she cares about the recycling not being contaminated by liquids.

Spending money on something for someone to enjoy is different from spending money on something to then have it be literally poured down the drain.

Plus, the OP would have created more work for her friend who would have had to go empty the wasted coke in the sink and then dispose of the can because the OP didn't have the grace or manners to dispose of it herself.

It is normal to not like to see things wasted.

That isn't consistent with the OP. The OP indicated the annoyance arose, not when the can was opened, but when the OP failed to take it with her.

Therefore, the state of OP's mouth makes no difference. Once she is has sipped from it, it is useless. It is equally useless if OP drinks it all. Logically, the outcome is the same for the OP's friend.

It's an entirely different AIBU if the question is, was the OP unreasonable to drink a can of Diet Coke at all in the morning.

In that case, I would say the onus was on the OP's friend to put the cans away somewhere. If the cans are still sitting in last night's buffet, unless the OP's friend makes it clear that the circumstances have changed and the cans are to be saved, it is reasonable for the OP to take it that they are still part of the buffet.

Maybe she knows where the ops mouth has been and that's why she was upset that she opened the can and only took a sip. She knew she could not possibly drink from the can after the op put her mouth on it. She was planning on drinking the coke herself until the op opened it and took a sip and then put it down. That's what pissed her off she wanted to drink it.

Sounds like she was grumpy because she was tired and hungover. Maybe you are a little bit sensitive too because of "beer fear"? Either way, sounds like it's blown over, I wouldn't worry x

No one is appreciating the logic of this situation, which places OP in the right.

There are two possible premises:

Attitude A: If a canned drink is opened and sipped, it becomes unfit for consumption by any party other than the party who sipped from it.

Attitude B: A third party can safely drink from a can opened and sipped by a friend.

Let's say both attitudes are equally valid.

Attitude A: Once the can is opened and sipped from, it becomes useless to anyone else. Therefore, it makes no difference if the OP takes 1 sip, drinks half of it, or finishes it off - once the can is opened, it becomes unusable by OP or anyone else.

Attitude B: The remains of the drink are a usable commodity, therefore OP's friend can finish off the can.

@coldayscientist @OkPedro

I will answer your question.

That would be the last time she came to my house I am not a tolerant person. My friendship group has the same morals and principles as me. I am a humble person I can't stand entitled people.

You mumbled sorry. Did you feel embarrassed when she pulled you up.

It's a stupid question to ask someone. You don't give away what you would do.

Get over yourself op! The correct thing would've been spilling the coke at you. I would be furious, why did you think it was ok to open a can to take 1 sip?? U sound extremely immature. Glad u got
Told off, she shouldn't need to apologise bc u don't seem to know how life works

No, I'm not the OP - I expect MNHQ could verify that if the thought is seriously troubling you.

Is that you @coldayscientist? Time for your beddybyes dear.

This is definitely one of my 'Mumsnet is a parallel universe' moments 😄

This wouldn’t be beyond the stretch of imagination given the level of manners she’s displayed thus far.

The "AIBU?" where the poster asks the question and refuses to acknowledge the many answers really does irritate me.

Yes, YABU. You should have taken the drink or finished it.

Imagine coming on Mumsnet and making up a story as you are so bored and pathetic ans have nothing better to do. You sound like someone with limited intelligence. Get a life

Me too 😊

Ridiculous overreactions on this thread - you'd think OP had shat into the can.

Your responses to people's comments explain exactly why your friend spoke to you like a child. You have wrote this on Aibu so yeah you were, not to have a drink in general, but to open have a sip leave it and then be confused as to why your friend got annoyed. If anything you should have just taken it with you? Don't think it's that big of a deal, however, in future I'd suggest taking a bottle of water so things like this don't happen again. Clearly bothered you since you wrote a post on aibu about it so take water next time and avoid the issue, that is if you are invited.