*Except the ‘??”? ??”? ??”? ???? ?. *
That’s a minhag, not a halachah. There is a difference!
That difference is not that it can be disregarded in someone else’s home!
Something which may have started as a ???? becomes a ???. Specifically by ??????, the ??”? says
“??? ?????? ?????? ?????? ?????? ???? ????? “.
The ?”?, when explaining the development of the ???, says, “?????? ????? ????” and, “????”.
*Except the ‘??”? ??”? ??”? ???? ?. *
Also worth mentioning is that we don’t even follow all the Remah’s minhagim! For example, the six closest Ashkenazic synagogues to me recite Hallel in shul on the first night of Pesach.
This one is universally (AFAIK) accepted by ???????.
“he claims he received such a psak”
What is the basis for such a psak. Gebrokts is agreed by everyone to be minhag, not halachah.
The minhag may have been to not allow keilim either.