It’s just not on to take someone’s stuff. I assume by the nature of the question it’s without permission otherwise it’s clearly okay.
I’ve always lived with people I know and can speak to, though, so it’s not that big a deal. I mean if your mate of 10 years does this as a one-off it’s hard to be too upset because you know they will replace or must have just not realised how much they could inconvenience you.
Equally, we always tried to have as much stuff as possible communal that had no particular brand or quality requirements: milk, olive spread, butter, washing up liquid, toilet rolls, etc.
Would also point out that as a veggie all my food falls into your ‘give a shit’ category so fuck off 