My father had a saying, "everyone had fun - but one". There is always one person who is a pain in the neck, who complains, who has to find fault. Chalk it up to the one and try (and sometimes it is hard to do) to laugh about it.
I organize a picnic every summer and a late "Christmas" party in January for a group of friends. One always complains about the meat selection at the picnic and another always complains about the choice of restaurant. It is sometimes hard to laugh them off, but I try.
Thank you for sharing. I love that!
I agree w/PP about tone. Tone changes everything.
I always heard it as "Every party has a p.o.o.p.e.r."
Back on track, I tend to agree with OP's who would give the picky eater friend the benefit of the doubt. The thing that made me think that Picky Eater was just asking was in the update, Nutella mentions running around for two hours getting the table and food ready. Perhaps Picky Eater was doing a sort of "just wondering if it got overlooked". However, I think Nutella's response was perfect. No need to get out your personal stash of cheese, fancy or otherwise, for this reason.
That being said, if someone asked me for a condiment at my home or party, I would provide it if I had it. No skin off my knuckles and IMHO, it's part of being a good host rather than questioning the menu. IRL, I had this happen a few weeks ago. Friend and I were having sandwiches for lunch. As a rule, I am choosy about which condiments I like (someone upthread mentioned no meat and mayo were their food preferences and I thought, hmmm, did I already post in this thread?

), so I didn't put anything on the bread, but did put out various jars and bottles of condiments. Friend asked for yellow mustard (fellow Americans, think "ball park" mustard). I told her I don't have that in my fridge nor pantry but she was welcome to choose from what I did have. Another time, someone asked for mayo with their fries and I went to the fridge and got it out for them. As long as I didn't have to eat the mayo, no prob.