You can't ban users who complain about an option, some complained correctly, some are over the topesque "I AM A CUSTOMER THOU SHALT KISS MY FEET OF HOLLINESS"..
Some don't read instructions, some just whack a button and expect things to happen. Some blame game bugs on the trainers. And some just lick windows.
But unless they attack staff etc you can't ban them :P
That's not true. The Terms Of Service Clearly state they can ban you anytime for any reason.
Why should they be allowed to run around and cause a scene and get games retired?
I don't mind that people have a problem with the trainer and want help. But the rules of EVERY site I have ever been on state not to flame people. There is a respectful way to go about getting help.