Brown noise does exist! It's certainly NOT a myth.
However, the only time you will ever encounter it is:
Telephone: Ring Ring
Tech Support: "Tech support, My name is (insert name here). How can I help you today."
Darwin Award candidate: (insert brown noise here)
An employee recently committed to buy a crapload of equipment for a major project which was just canned after management realised it may actually succeed. The boss has just called them into his office & their mortgage, car loan, and all the bills are due next week.
Boss: (brown noise here).
Employee heads down to the unemployment office, via his house for a clean pair of pants.