When I was 12, was wearing a cross necklace. Some guy (not sure if he was Mormon or what) asked me why I didn’t just wear a little electric chair around my neck.
I told him that Jesus didn’t die in the electric chair. He just pursed his lips and walked away.
Maybe you could have asked him why he wears so called “holy underwear”.
I have had my mormon family tell me it is sick, I have a necklace with a little silver cross.