I'm staggered that you've experienced that Iam64. Although I'm Welsh by birth, my accent is very broad Mancunian. I've never experienced anything remotely like you have and I've worked all over the UK, including London and the South East. Sure, I've had people asking me to explain what some of my Mancunian colloquialisms mean and they've often imitated them, but always in jest, never spitefully. Maybe it's the people I attract.