Here’s another scenario that rephrases the OP’s question, without the complications of CY vs CS.
There are various kosher l’mehadrin hechsherim, different people hold by different ones. None are treif, obviously.
Say I eat a wide range of those, we will call them Hechsher K, L, M, N and P. Hechsher K is found on many items, and is one of the few hechsherim that is accepted by everyone, but it is also more expensive than the others on things like chicken and meat. I am very price conscious when I shop, buy things when they are on sale, and when it comes to a choice between 2 brands, the price will be the most deciding factor. So I will not buy chicken with K hechsher because it is so much more money than M or N.
If I was sending in a snack item for a kid’s school party, or preparing something for a friend’s kiddush, I would make sure to buy/use items only with Hechser K, but those are not expensive, and they are to be consumed outside of my home.
Now Reuven is coming to my house for shabbos, and he only eats hechsher K. Do I accommodate him and buy the more expensive K chicken? Should I ask him in advance what hechsherim he eats? I know there are many people who are makpid on certain hechsherim at home, but when they go to another frum person, they don’t ask questions. But as the host, how far should I go to try to accommodate their optimal standards?
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