My gardening friend started it in the eighties when he insisted on pronouncing Ficus as you would say fickle. Later I learned it was actually Ficus, the i being like eye. But to this day, I cannot bring myself to say it this way.
Along came gardening guru Don Burke in the nineties, late eighties even. Never liked him, although he was interesting and entertaining. He used to say PERgola rather than perGOLa. He may well have been technically correct, but it sounds stupid. Stick with the way most people say it.
There was a brief period in the nineties when people started saying HiMALayas rather than HimaLAYas.
Pattaya in Thailand was another. Fortunately the PatTAYa pronounciation seems to have died.
I am just not going down the road of new names for Indian cities. Calcutta will not become Kolkutta in my world. My Indian workmates still call Madras as such when discussing cricket in Chennai and how could the glorious city of Bombay become Mumbai.
Saigon became Ho Chi Minh City. Only technically. No local used it. Saigon will always be Saigon.
Myanmar seems to have disappeared and we are back to Burma and Rangoon, not Yangon. Fortunately they left Mandalay alone. The Road to 'insert alternative to Madalay' would not have been nearly as melodic.
Cambodia changed to the Democratic Republic of Kampuchea. I used Kampuchea for a while, but it reverted to Cambodia and I wondered why I bothered changing.
I call Rome, Rome, not Roma. I call Paris, Paris, not Paree (although I might say gay Paree for theatrical effect). I think I shall revert to calling Beijing Peeking.
My pet peeve words remain constant.
Sport commentators have a lot to answer for as they are who promoted 'back to back' instead of consecutive. What is wrong with consecutive wins?
The biggest gripe of all for me, disorientated. Why not disoriented? I am disorientated. I am disoriented. Why add extra? It is a battle lost already.
And to finish, one that never occurred to me, but I heard of recently, why would you abbreviate world wide web, three syllables, to www, nine syllables? In fact let www just die. It has served its purpose. It is no longer needed. Just forget the http://www. No longer required and please people on the radio, stop laboriously saying www.