For all banking and savings queries I would take at look at Money Saving Expert http://www.moneysavingexpert.com/banking/
You've got to remember that without a current account your credit rating will be poor, and therefore it's perhaps best to start with a basic account.
Prove to the bank that you are good customers by paying bills from that account on time and you'll be able to upgrade to a current account in no time.
It's probably got nothing to do with being disabled, it's more likely that you ran into a rude "customer" sales assistant and they would've been that way with any person receiving benefits.