do what i do, if they don't like it they're free to leave.
CM, Prae, Ifrit can all be easily done with AF1 gear, just make sure you have lvl 47-49 accessories and a decent weapon.
If the people doing DF are so damn concerned about the gear people are using then they are free to form a premade on their server, otherwise screw em and their wanna be "elitist" attitude.

CM and Prae are story dungeons, they're meant to be done with AF1 at least.