lol go to a Dolphins board, you will never see one of their fans attempting to throw Tannehill under the Bus, same with the Bears and Cutler, or the Rams and Bradford, or the Lions with Stafford...
Know how I can tell you've never been to those boards?
Bradofrd, Tannehill and Stafford have all been bashed by fans on their own forums (go look; it's not hard to find) but the most ridiculous of those suggestions is that Bear fans never criticize Cutler. A pretty solid portion of them wanted to keep Josh McCown as the starter last year and this year and were pissed when they didn't.
Every fanbase has people that don't like the QB, including the best of them. Heck, even Peyton Manning has people ready to dump him for the next guy up after last year's Super Bowl. This is why you have the old saying "the backup quarterback is always the most popular guy on the team".
It is true that some fanbases have more quarterback critics than others, but I don't see the Panthers having a higher percentage among the bunch, and definitely not the highest. If you believe that, go to a Cowboy board and start a talk about Tony Romo or look back at prior Jag fan discussions about Blaine Gabbert.