My father was always makpid about this!
He said something about losing ones parents. I guess like others mentioned it has something to do with Aveilus. Mustn’t be directly realted since avelim do wear shoes just not leather ones..
I now know that since we have Hungarian origin that is why we are makpid and my husbands family isn’t.. It leaves me to institute it in our home.. which I do try to do!