Confirmation bias is real. But some cables do make a difference. If you can’t hear it you either have the wrong cables, an insufficient system, an inability to hear those differences or confirmation bias against cables.
+1 @zlone
Do your ears deceive you?
If you think cables, interconnects or other wiring make a difference, yes they do. This is a long article so I won't post it here but will a link describing how blind testing results in correct guessing that is no more accurate than random chance. Enjoy.