Guarantee? Where can I collect on this bar bet?

Taxiway D at KATL is indeed referred to as "Dixie" and not the standard "Delta"

Check http://www.airnav.com/airport/KATL and you will see down in the additional remarks (just a transcription of same from the official FAA Airport & Facility Directory) that there is a reference to Taxiway Dixie. I don't think it makes any sense. I don't think it adds to safety. But the fact remains that it is the officially recognized terminology at KATL.

Why "Delta 1234 is clearing at Delta 5 for Delta 32" is acceptable at every other airport in the world but unsafe at KATL is beyond me.

KORD used to have a bunch of colorful non-standard taxiway names (Jog, Lakeshore Drive, The [insert runway designator] Parallel, Penalty Box, et. al.) but they were redesignated years ago to improve safety and standardization.

Also think you have really overstated the degree to which ATC phraseology is standardized in practice around the world. If controllers really got written up for every utterance of non-standard phraseology A) the system would grind to a halt because each transmission in busy airspace would take twice as long ("American 25, heading 360, speed 210, call approach 3365" versus "American 25, turn left heading Three Six Zero reduce speed to Two One Zero knots and contact Chicago Approach on one three three decimal six five") and B) there wouldn't be any controllers left controlling planes since they'd all be busy at union grievance hearings!

Subtle but acceptable (above probably isn't "acceptable" even though it's how the real world of ATC works) differences in ATC phraseology abound throughout the world...

Flight Level Two Zero Zero versus Flight Level Two Hundred... Omission of "flight" with respect to flight level altitudes... "Cleared for the ILS approach" versus "Descend ILS"... And don't even get me started on the dangers of non-standard transition levels and partial metricization throughout the world.