You can be adamant all you want and call people fools if you wish. We know, objectively, that cables don’t make audible differences unless they’re extremely bad.
Your average lamp cord is indistinguishable from regular copper speaker wire, and what ever expensive cable you think is better.
I don’t see any room for debate on this. We can measure these cables to a degree of precision that is far, far, more nuanced, sensitive, and detailed than anyone’s hearing can ever be.
It’s simple. They make false claims that influence others to spend money. It’s a lie. Helping others not waste money on a lie is a reasonable think to want to do. Challenging predatory retail practices, and revealing the grift is useful to those who care.