Actually this attitude is somewhat understandable, IMO.
There are certain brands I have developed an immense aversion to because of the pushy cultists who tell people explicitly or implicitly that they're inferior or they aren't 'real vapers' if they've never bought a certain product. There are certain times of day I avoid the forum because it's like walking into a cross between a televangelist convention and a telemarketing center. It's a turnoff. I get it.
But...then I try to remind myself that really isn't fair to hate on Provari, or Five Pawns, or Reo, or Ahlusion, or Nicoticket, or Virgin Vapor, or...or...or... just because they have overzealous fanbois. It's not the vendor's fault.
Sometimes I'm more successful than others, I'll admit.
MBV fans have it a little harder because of the price of their product. It's not just the usual "Mine's bigger/better/more expensive/more complicated than yours" but a lot of outright snobbery about who does and does not belong to the world of vaping. The fact that MBV fulfills an important role for a large portion of the market not served by the expensive "real vaper" toys appears to be unimportant, or maybe even a threat to those who think only the amount you spend matters or only certain people should have a voice.
I have no problem with high dollar collectors and hobbyists and those who willingly pay $1/ml or more for juice. If that's what you like have fun! I say that with no irony whatsoever. But I do get slightly annoyed at times when that openmindedness isn't returned to those of us who aren't interested in that path.
MBV doesn't work for everybody. Nothing does. It would be silly to try to claim otherwise. But seriously, if you can't understand why MBV users are sometimes defensive when the snobs and haters pile on, you don't understand much about people.