"Droring" seems to me to be regional in British English. I hear it more in the North and in London.
As a child, I had elocution lessons from a scouser in Liverpool. She insisted on pronouncing the word "with" as "hwith", with the "th" hardened as in "thought", rather than softened as in "the". As a consequence I misspelled "with" for many years. Try to avoid taking elocution lessons from someone with a non-standard accent!
I enjoy regional pronunciations. I don't want them ruled to be somehow incorrect. But I deplore incorrect usage, such as "literally" to mean figuratively. M-W says that figuratively is a correct usage of literally, even though it means the exact opposite.