It's not the cartridge, as much as it is the supporters that have created this situation of hate. Same thing with Savage rifles. It's not that they're bad guns, it's that the supporters have created this fake level of superiority by putting everybody else's products down. I gather my own info based on personal experiences as to why I don't like Savages, and that's because I personally packed up and shipped back more of them than any other brand of rifle, for repair or replacement for customers, back when I worked at the gun store. That's why I don't like them. The supporters talking crap about Remington all the time, when they're gun is a 90% ripoff of a 700 action, is also pretty annoying.
Back to the Creedmoor... It's because every idiot and their brother who knows nothing about guns, owns one so they can feel cool. Cartridge performance aside, it's become a trend to own a 6.5 Creedmoor. Which is why I started calling it a "hipster cartridge" years ago. It has become a trend, just like hipsters are. And hipsters look retarded dressing and acting the way they do, and they're complete ironic hypocrites, and that's why everybody makes fun of them.
The Creedmoor also gets alot of hate, because people have created this false mystique about the 6.5 Creedmoor as if it was designed by God himself and handed down to Thor for him to forge with his hammer from unicorn horns and King Midas' leprechaun rainbow gold. As if you can go buy one off the shelf, slap on a high-powered optic, buy some Hornady match ammo, and drive straight to your local 1K range, and hit on the first shot, despite having never shot over 100-200 yards in your life, prior to owning your new Creedmoor.
It's the same with everything these days, it's like 90% of the world is completely uninformed morons. False advertising, participation trophies, fake news, and BS late night TV show hosts spouting mass amounts of bullcrap have made them this way. They think they can go buy a $3,000 Gibson Les Paul and immediately start playing like Slash... Or they can go buy a Ferrari, and immediately start driving like Mario Andretti... It's like 90% of the world has cognitive failure of logic and reasoning.