Eh, that’s doesn’t mean there’s not something to it. It may not be in your head after all. No one really knows but you.
There’s lots of people that swear they can hear differences in cables, regardless of what FR measurements show. And others who can’t hear any difference and swear it’s complete bollocks.
The way I see it, as long as you enjoy your gear with whatever cable sounds best (or looks best, or is least microphonic, or is your favorite color, or a good length for you), then who cares what anyone else says or thinks.