Not really mean spirited though if friend needed the cash.
If a mate asked, and I didn't need the item/cash I would consider it. And part of that consideration includes how the person asked.
If asked nicely, I would have looked around to see if anything else could bring me the cash needed, or is there something else I liked.
Question if something will fit me, no matter how it is worded and I will keep and sell it. I am not going to spend time looking for something else when regardless of how it is worded, it's not nice.
A decent mate wouldn't have put a mate in that scenario. Mine wouldn't. If yours do, are they really your mates? I would rather me mateless.
You are implying a person is fat.
If friends ask do you think this fits me, does it make me look fat/thin/small/tall? That is completely different and the person wants your objective, honest answer.
I've already got an idea in my mind if something fits. It might be too small for me at that moment. People do this all the time as a goal. Look at wedding dresses, bought slightly small in a way to lose weight.
Business and friends don't mix.
Communication resolves everything. Even if that communication is loud fuck off. Had op, and others in similar situations asked the person, they would know a part of the truth the person wants them to know. Much easier than sitting around making up shit based on how we would do things. If mate was a selfish dickhead, then yea see ya.
I don't base things on purely what I see, I want to know the motivation around it. It may be justifiable. Not saying I never make snap judgements, I am alive. When I realise a mistake has been made, even when it's pointed out to me. I look at it and see there is another side and I want to know.
The friend may not see if she has made a mistake because the item was about business. And sometimes you can never switch off from this, which I think a lot of people are understandably missing as well.