Perhaps they really like the cheddar cubes.

That's true, but in general I don't think when you give permission for someone to try your food you expect them to take more than one or two pieces. At least, that's how I was taught, so OP probably wasn't thinking that she'd eat so much of it that he needed a disclaimer.

but it's only $3, why to be so mean?

If it's "only 3$" then it should be no issue for her to buy a new one.

3$ is a lot of money to the people who don't have a lot of them

The dollar sign goes before the number

But if you don't have much, why are you spending that $3 on cheese you don't like?

I'd rather not be friends with someone that rude and inconsiderate

@#14 maybe that poster is French. The French put the dollar sign after, and use commas instead of decimal points. 3,00$ is correct if you're French.

Couldn't agree more. Now there's the possibility of op liking that person less, being rude to her, or lashing out after having bottled up all these feelings for awhile. All of which is unfair to her friend because the friend has no idea she's even done anything wrong. Don't ruin this friendship op because you bottle everything up, never say what you're thinking and/or let people walk on you. People aren't mind readers, you have to tell them what you're thinking. Your friend probably left thinking you guys had a great lunch together.

I don't understand how anyone can see going through and picking out all of one thing without permission to be not rude.

A coworker doesn't automatically equal friend.

For all we know, there were only 3 or 4 cheddar ones, and a whole bunch of other flavours. I don't think anyone but op is at fault here.

Yeah, $3 probably only buys about 16 cubes, and if there are 3-4 types (cheddar, pepper jack, American, Swiss being a common combo I see in these mini platters) there's only a few of each.

It doesn't matter how many are there, you ask for what you want to take. Trying out a whole thing isn't the same as I want this specific thing, and taking all of one thing is extremely rude regardless unless you have specific permission to.