Bad luccck.

Today I got some new shoes, I love them (L)
I showed my new shoes to my parents and put them on the table.
As we all know new shoes on the table is bad luck.
Mick shouted at me and I thought he was joking, so I was just like yeah haha piss off.
But then he got really angry and shouited at me to get them off the table.
He's an atheist, what if bad luck is the only thing people can base their life on.
Bah, I don't know what to think anymore.