Same here, I treat all wishlists and suggestions as wishes and suggestions, not demands.
From my over 2400 sent cards, only 3 or 4 profiles were what I thought as picky or demanding (or I still remember them).
And from these, 2 were from the same person.
But, it might be, that also in normal life, if someone tells me that they wish me to do something, I interpret it so that I have also the choice to not fulfil their wish.
And, in Postcrossing we are equal (and this is one part of why I love this!). Why would someone think they can tell me what to do, or what I can’t do/send. It’s in fact a little funny to think someone trying to boss around other members.
I have read the rules, and in my understanding they are clear, and I follow them. That’s enough.
Very complaining or picky/demanding people I treat as children having a tantrum, it goes over. They can try to be little bosses, but they can’t be that for me. It takes a lot that I would let someone tell me what to do.
But, I like to read wishlists, and send a card that they might prefer, because why not ?
I think, there might be some kind personal trait, who think a wish is more than a wish, and they think it is supposed to be followed. Maybe even too angry people previously in their life, who disguise orders in form of a wish, so the person gets confused when they actually can choose. But here, every one can .