Nobody is whining. Nobody is a "phobe". Nobody is more or less biased than anyone else, as by definition this is a matter of opinion and preference. Some fans like the general direction NASCAR has gone in recently, and generally prefer to watch drivers forced to control higher-powered cars with less downforce. I'm one of those. That's how you separate the men from the boys (or the women from the girls).
Those on the opposite side place a premium on closer racing, and prefer lower-powered cars with higher downforce that are essentially glued to the track and each other. Many are openly critical of a few drivers being dominant and want everyone to be more 'equal'. This approach creates an entirely different kind of momentum-based racing that doesn't reward traditional car control racing skills.
People who favor the new package aren't happy with the current one. If they were, they wouldn't support radical change.
Finally, "Don't criticize it until you've seen it" is another cheap rhetorical trick that is designed to eliminate criticism until it is too late and what's done is done. Anyone who is familiar with motorsports knows what kind of racing is produced by cutting power and increasing downforce. All any of us can do is state our individual opinions and hope they have some impact.